1879

• Thomas, O. 1879. On Robert Kerr's translation of the "Systema Naturae' of Linnaeus. Annals and Magazine of Natural History, series 5, 4: 397.

1880

• Thomas, O. 1880. Description of a new species of Mus from the Fiji Islands. Proceedings of the Zoological Society of London 48(1): 11–13, 1 fig. DOI: 10.1111/j.1096-3642.1880.tb02722.x BHL Reference page. 

• Thomas, O. 1880. On the Myoxus elegans of Temminck. Proceedings of the Zoological Society of London 48(1): 40–41. DOI: 10.1111/j.1096-3642.1880.tb02724.x BHL Reference page. 

• Thomas, O. 1880. Description of a new bat from Java, of the genus Kerivoula. Annals and Magazine of Natural History, series 5, 5(30): 472-473, 1 fig. DOI: 10.1080/00222938009459445 BHL Reference page. 

• Thomas, O. 1880. On bats from Old Calabar. Annals and Magazine of Natural History, series 5, 6(32): 164–167, 2 figs. DOI: 10.1080/00222938009458914 BHL Reference page. 

• Thomas, O. 1880. On mammals from Ecuador. Proceedings of the Zoological Society of London 48(3): 393–403, figs 1-3, pl. 38. DOI: 10.1111/j.1469-7998.1880.tb06571.x BHL Reference page. 

• Thomas, O. 1880. Description of a new species of Arvicola from northern India. Annals and Magazine of Natural History, series 5, 6(34): 322–323. DOI: 10.1080/00222938009458945 BHL Reference page. 

1881

• Thomas, O. 1881. Description of a new species of Mus from southern India. Annals and Magazine of Natural History, series 5, 7(37): 24. DOI: 10.1080/00222938109459467 BHL Reference page. 

• Thomas, O. [1880] 1881. Description of a new species of Reithrodon, with remarks on the other species of the genus. Proceedings of the Zoological Society of London 48(4): 691–696, figs. 1–4. BHL Reference page. 

• Thomas, O. 1881. Description of a new species of mole from China. Annals and Magazine of Natural History, series 5, 7(42): 469–471. DOI: 10.1080/00222938109459556 BHL Reference page. 

• Thomas, O. 1881. Account of the zoological collections made during the survey of H.M.S. 'Alert' in the Straits of Magellan and on the coast of Patagonia. I. Mammalia. Proceedings of the Zoological Society of London 49(1): 3–6, figs. 1–2. DOI: 10.1111/j.1096-3642.1881.tb01270.x BHL Reference page. 

• Thomas, O. 1881. Description of a new species of Alactaga from Mesopotamia. Annals and Magazine of Natural History, series 5, 8(43): 14–16. DOI: 10.1080/00222938109459834 BHL Reference page. 

• Thomas, O. 1881. On the Indian species of the genus Mus. Proceedings of the Zoological Society of London 49(3): 521–557, pls. 50–51. DOI: 10.1111/j.1096-3642.1881.tb01311.x BHL Reference page. 

1882

• Thomas, O. 1882. Description of a new genus and two new species of Insectivora from Madagascar. Journal of the Linnean Society of London 16(92): 319–322, 1 fig. DOI: 10.1111/j.1096-3642.1882.tb02284a.x BHL Reference page. 

• Thomas, O. 1882. On the African mungooses. Proceedings of the Zoological Society of London 50(1): 59–93, fig. 1, pl. 3. DOI: 10.1111/j.1096-3642.1882.tb02728.x BHL Reference page. 

• Thomas, O. 1882. On a collection of rodents from north Peru. Proceedings of the Zoological Society of London 50(1): 98–111, pl. 4. DOI: 10.1111/j.1096-3642.1882.tb02730.x BHL Reference page. 

• Thomas, O. 1882. On a small collection of rodents from South-Western Africa. Proceedings of the Zoological Society of London 50(1): 265–267, pl. 14. DOI: 10.1111/j.1096-3642.1882.tb02741.x BHL Reference page. 

• Thomas, O. 1882. On two new Muridae from Tasmania. Annals and Magazine of Natural History, series 5, 9(54): 413–416, figs. 1–4. DOI: 10.1080/00222938209459071 BHL Reference page. 

• Thomas, O. 1882 On a small collection of Mammalia from central Mexico. Proceedings of the Zoological Society of London 50(2): 371–372. DOI: 10.1111/j.1469-7998.1882.tb06637.x BHL Reference page. 

• Thomas, O. 1882. Description of a new species of rat from China. Proceedings of the Zoological Society of London 50(3): 587–588, pl. 44. DOI: 10.1111/j.1096-3642.1882.tb02769.x BHL Reference page. 

1883

• Thomas, O. [1882] 1883. Description of two new species of Pteropus from the Caroline Islands. Proceedings of the Zoological Society of London 50(4): 755–757, pls. 54–55. DOI: 10.1111/j.1096-3642.1883.tb02792.x BHL Reference page. 

• Thomas, O. 1883. On Mustela albinucha, Gray. Annals and Magazine of Natural History, series 5, 11(65): 370–371, 1 fig. DOI: 10.1080/00222938309459165 BHL Reference page. 

1884

• Thomas, O. 1884. On a collection of Muridae from central Peru. Proceedings of the Zoological Society of London 52(3): 447–458, pls. 42–44. DOI: 10.1111/j.1096-3642.1884.tb02857.x BHL Reference page. 

• Thomas, O. 1884. Description of a new species of Microgale. Annals and Magazine of Natural History, series 5, 14(83): 337–338. DOI: 10.1080/00222938409460967 BHL Reference page. 

1885

• Thomas, O. 1885. Report on the mammals obtained and observed by Mr. H. H. Johnston on Mount Kilimanjaro. Proceedings of the Zoological Society of London 53(2): 219–222, pl. 12. DOI: 10.1111/j.1096-3642.1885.tb02898.x BHL Reference page. 

• Thomas, O. 1885. Notes on the characters of the different races of Echidna. Proceedings of the Zoological Society of London 53(2): 329–339, pls. 23–24. DOI: 10.1111/j.1096-3642.1885.tb02914.x BHL Reference page. 

• Thomas, O. 1885. [Remarks on a burrowing rodent, Heterocephalus phillipsi, n. sp.]. Proceedings of the Zoological Society of London 53(3): 611–612. DOI: 10.1111/j.1469-7998.1885.tb07866.x BHL Reference page. 

1886

• Thomas, O. 1886. Diagnoses of three new Oriental mammals. Annals and Magazine of Natural History, series 5, 17(97): 84. DOI: 10.1080/00222938609460115 BHL Reference page. 

• Thomas, O. 1886. Description of a new Brazilian species of Hesperomys. Annals and Magazine of Natural History, series 5, 17(99): 250–251. DOI: 10.1080/00222938609460140 BHL Reference page. 

• Thomas, O. [1885] 1886. Notes on the rodent genus Heterocephalus. Proceedings of the Zoological Society of London 53(4): 845–849, pl. 54, figs. 1–5. DOI: 10.1111/j.1096-3642.1885.tb02925.x BHL Reference page. 

• Thomas, O. 1886. On the mammals presented by Allan O. Hume, Esq., C.B., to the Natural History Museum. Proceedings of the Zoological Society of London 54(1): 54–79, pls. V–VI. DOI: 10.1111/j.1096-3642.1886.tb02935.x BHL Reference page. 

• Thomas, O. 1886. Diagnosis of a new species of Phascologale. Annali del Museo Civico di Storia Naturale di Genova series 2, 4(24): 208. BHL Reference page. 

• Thomas, O. 1886. Note on Hesperomys pyrrhorhinus, Pr. Max. Annals and Magazine of Natural History, series 5, 18(108): 421–423. DOI: 10.1080/00222938609459994 BHL Reference page. 

• Thomas, O. & Doria, G. 1886. Note intorno ad alcuni Chirotteri appartenenti al Museo Civico di Genova e descrizione di due nuove specie del genere Phyllorhina. Annali del Museo Civico di Storia Naturale di Genova, series 2, 4(24): 201–207, 1 fig. BHL Reference page. 

1887

• Thomas, O. 1887. Description of a second species of rabbit-bandicoot (Peragale). Annals and Magazine of Natural History ser 5, 19: 397–399.
• Thomas, O. 1887. On the small mammals collected in Demerara by Mr. W. L. Sclater. Proceedings of the Zoological Society of London 1887: 150–153.
• Thomas, O. 1887. Report on a zoological collection made by the officers of H. M. S. 'Flying Fish' at Christmas Island, Indian Ocean. I. Mammalia. Proceedings of the Zoological Society of London 1887: 511–514.

1888

• Thomas, O. 1888. Catalogue of the Marsupialia and Monotremata in the collection of the British Museum (Natural History). British Museum (Natural History), London, 401 pp., 33 pls.
• Thomas, O. 1888 [1889]. On the mammals of Christmas Island. Proceedings of the Zoological Society of London 1888:532-534.
• Thomas, O. 1888. On a new and interesting annectant genus of Muridae, with remarks on the relations of the Old- and New-World members of the family. Proceedings of the Zoological Society of London 1888: 130–135.
• Thomas, O. 1888. On a collection of mammals obtained by Emin Pasha in equatorial Africa, and presented by him to the Natural History Museum. Proceedings of the Zoological Society of London 1888: 3–17.

1890

• Thomas, O. 1890. On a collection of mammals obtained by Dr. Emin Pasha in central and eastern Africa. Proceedings of the Zoological Society of London 1890: 443–450.

1892

• Thomas, O. 1892. On some new Mammalia from the East-Indian Archipelago. Annals and Magazine of Natural History ser 6, 9: 250–254.
• Thomas, O. 1892. On some mammals from Mount Dulit, North Borneo. Proceedings of the Zoological Society of London 1892: 221–227.
• Thomas, O. 1892. On the probable identity of certain specimens formerly in the Lidth de Jeude collection and now in the British Museum, with those figured by Albert Seba in his 'Thesaurus' of 1734. Proceedings of the Zoological Society of London 1892: 309–318.

1893

• Thomas, O. 1893. On some new Bornean mammalia. Annals and Magazine of Natural History ser 6, 11: 341–347.

1894

• Thomas, O. 1894. On the mammals of Nyasaland: Third contribution. Proceedings of the Zoological Society of London 1894: 136–142.

1895

• Thomas, O. 1895. Preliminary diagnoses of new mammals from northern Luzon, collected by Mr. John Whitehead. Annals and Magazine of Natural History ser 6, 16: 160–164.

1896

• Thomas, O. 1896 [1897]. On the genera of rodents: An attempt to bring up to date the current arrangement of the order. Proceedings of the Zoological Society of London 1896: 1012–1028.

1897

• Thomas, O. 1897. On the mammals collected in British New Guinea by Dr. Lamberto Loria. Annali del Museo Civico di Storia Naturale di Genova ser 2, 18: 1–19.
• Thomas, O. 1897 [1898]. On the Mammals obtained by Mr. A. Whyte in Nyasaland, and presented to the British Museum by Sir H. H. Johnston, K. C. B.; being a fifth contribution to the mammalfauna of Nyasaland. Proceedings of the Zoological Society of London 1897: 924–938.
• Thomas, O. 1897. Description of new bats and rodents from South America. Annals and Magazine of Natural History, 6th Ser., 20(120, December):544–553. DOI: 10.1080/00222939709487398 . BHL. Reference page. 

1898

• Thomas, O. 1898. On indigenous Muridae in the West Indies; with the description of a new Mexican Oryzomys. Annals and Magazine of Natural History ser 7, 1: 176–180.
• Thomas, O. 1898. On the mammals collected by Mr. John Whitehead during his recent expedition to the Philippines with field notes by the collector. Transactions of the Zoological Society of London 14: 377–414.

1899

• Thomas, O. 1899. On some small mammals from the District of Cuzco, Peru. Annals and Magazine of Natural History, series 7, 3(13): 40–44. DOI: 10.1080/00222939908678073 BHL Reference page. 

• Thomas, O. 1899. On a new species of Marmosa. Annals and Magazine of Natural History, series 7, 3(13): 44–45. DOI: 10.1080/00222939908678074 BHL Reference page. 

• Thomas, O. 1899. On new small mammals from South America. Annals and Magazine of Natural History, series 7, 3(14): 152–155. DOI: 10.1080/00222939908678093 BHL Reference page. 

• Thomas, O. [1898] 1899. On mammals collected by Mr. J. D. La Touche at Kuatun, N.W. Fokien. China. Proceedings of the Zoological Society of London 66(4): 769–775. DOI: 10.1111/j.1096-3642.1898.tb03180.x BHL Reference page. 

• Thomas, O. 1899. Description of a new Phascogale from British New Guinea, obtained by Dr. L. Loria. Annali del Museo Civico di Storia Naturale di Genova, series 2, 20(40): 191–192. BHL Reference page. 

• Thomas, O. 1899. Descriptions of new Neotropical Mammals. Annals and Magazine of Natural History, series 7, 4(22): 278–288. DOI: 10.1080/00222939908678198 BHL Reference page. 

• Thomas, O. 1899. Descriptions of new rodents from the Orinoco and Ecuador. Annals and Magazine of Natural History, series 7, 4(23): 378–383. DOI: 10.1080/00222939908678217 BHL Reference page. 

1900

• Thomas, O. 1900. The geographical races of the Tayra (Galictis barbara), with notes on abnormally coloured individuals. Annals and Magazine of Natural History ser 7, 5: 145–148.
• Thomas, O. 1900. List of mammals obtained by Mr. H. J. Mackinder during his recent expedition to Mount Kenya, British East Africa. Proceedings of the Zoological Society of London 1900: 173–180.

1901

• Thomas, O. 1901. The generic names Myrmecophaga and Didelphis. American Naturalist 35: 143–145.
• Thomas, O. 1901. On mammals obtained by Mr. Alphonse Robert on the Rio Jordao, Minas Geraes. Annals and Magazine of Natural History ser 7, 8: 526–536.

1902

• Thomas, O. 1902 [1903]. On a collection of mammals from Abyssinia including some from Lake Tsana collected by Mr. Edward Degen. Proceedings of the Zoological Society of London 1902: 308–316.
• Thomas, O. 1902. On the geographical races of the kinkajou. Annals and Magazine of Natural History ser 7, 9: 266–270.
• Thomas, O. 1902. On some new forms of Otomys. Annals and Magazine of Natural History, ser. 7, 10: 311–314.

1903

• Thomas, O. 1903. LXXII.— On the species of the genus Rhinopoma. Annals and magazine of natural history, 7th ser. 11: 496–499. BHL
• Thomas, O. 1903. Notes on Neotropical mammals of the genera Felis, Hapale, Oryzomys, Akodon, and Ctenomys, with descriptions of new species. Annals and Magazine of Natural History ser 7, 12: 234–243.

1904

• Thomas, O. 1904 [1905]. On Hylochoerus, the forest pig of Central Africa. Proceedings of the Zoological Society of London 1904(2): 193–199.
• Thomas, O. 1904. New Callithrix, Midas, Felis, Rhipidomys, and Proechimys from Brazil. Annals and Magazine of Natural History ser 7, 14: 188–196.
• Thomas, O. 1904. On mammals from northern Angola collected by Dr. W. J. Ansorge. Annals and Magazine of Natural History ser 7, 13: 405–421.

1905

• Thomas, O. 1905 [1906]. The Duke of Bedford's zoological exploration in eastern Asia. – 1. List of mammals obtained by Mr. M. P. Anderson in Japan. Proceedings of the Zoological Society of London 1905(2): 331–363.
• Thomas, O. 1905. On new Japanese mammals (Insectivora, Rodentia). Annals and Magazine of Natural History ser 7, 15: 487–495.

1906

• Thomas, O. 1906. Descriptions of new mammals from Mount Ruwenzori. Annals and Magazine of Natural History ser 7, 18: 136–147.
• Thomas, O. 1906. Two new genera of small mammals discovered by Mrs. Holms-Tarn in British East Africa. Annals and Magazine of Natural History ser 7, 18: 222–226.
• Thomas, O. 1906. New mammals collected in north-east Africa by Mr. Zaphiro, and presented to the British Museum by W. N. McMilan, Esq. Annals and Magazine of Natural History ser 7, 18: 300–306.
• Thomas, O. 1906. Notes on South American rodents. II. On the allocation of certain species hitherto referred respectively to Oryzomys, Thomasomys, and Rhipidomys. Annals and Magazine of Natural History ser 7, 18: 442–448.

1907

• Thomas, O. 1907. On further new mammals obtained by the Ruwenzori Expedition. Annals and Magazine of Natural History ser 7, 19: 118–123.
• Thomas, O. 1907. On Neotropical mammals of the genera Callicebus, Reithrodontomys, Ctenomys, Dasypus, and Marmosa. Annals and Magazine of Natural History ser 7, 20: 161–168.

1909

• Thomas, O. 1909. Some mammals from N.E. Kimberley, Northern Australia. Annals and Magazine of Natural History, series 8, 3(14): 149–152. DOI: 10.1080/00222930908692558 BHL Reference page. 

• Thomas, O. 1909. On mammals collected in Turkestan by Mr. Douglas Carruthers. Annals and Magazine of Natural History, series 8, 3(15): 257–266. DOI: 10.1080/00222930908692572 BHL Reference page. 

• Thomas, O. [1908] 1909. The Duke of Bedford's zoological exploration in eastern Asia.— XI. On mammals from the provinces of Shan-si and Shen-si, northern China. Proceedings of the Zoological Society of London 78(4): 963–983. DOI: 10.1111/j.1469-7998.1908.00963.x BHL Reference page. 

• Thomas, O. 1909. On the N. Australian rats referred to the genus Mesembriomys. Annals and Magazine of Natural History, series 8, 3(16): 372–374. DOI: 10.1080/00222930908692593 BHL Reference page. 

• Thomas, O. 1909. New species of Paradoxurus of the P. philippinensis group, and a new Paguma. Annals and Magazine of Natural History, series 8, 3(16): 374–377. DOI: 10.1080/00222930908692594 BHL Reference page. 

• Thomas, O. 1909. New species of Oecomys and Marmosa from Amazonia. Annals and Magazine of Natural History, series 8, 3(16): 378–380. DOI: 10.1080/00222930908692595 BHL Reference page. 

• Thomas, O. 1909. The generic arrangement of the African squirrels. Annals and Magazine of Natural History, series 8, 3(18): 467–475. DOI: 10.1080/00222930908692611 BHL Reference page. 

• Thomas, O. 1909. [Exhibition of specimens of a new rat which had been obtained by Mr. G. C. Shortridge during the Society's collecting expedition to Central America]. Abstracts of the Proceedings of the Zoological Society of London No. 73: 32. BHL Reference page. 

• Thomas, O. 1909. New African small mammals in the British Museum collection. Annals and Magazine of Natural History, series 8, 4(20): 98–112. DOI: 10.1080/00222930908692647 BHL Reference page. 

• Thomas, O. 1909. A new gibbon from Annam. Annals and Magazine of Natural History, series 8, 4(20): 112–113. DOI: 10.1080/00222930908692648 BHL Reference page. 

• Thomas, O. 1909. Two new mammals from northern Australia. Annals and Magazine of Natural History, series 8, 4(21): 197–198. DOI: 10.1080/00222930908692661 BHL Reference page. 

• Thomas, O. 1909. Notes on some South-American mammals, with descriptions of new species. Annals and Magazine of Natural History series 8, 4(21): 230–242. DOI: 10.1080/00222930908692666 BHL Reference page. 

• Thomas, O. 1909. A new rat from Guatemala. Proceedings of the Zoological Society of London 79(3): 669–670. BHL Reference page. 

• Thomas, O. 1909. Four new African squirrels. Annals and Magazine of Natural History, series 8, 4(23): 476–479. DOI: 10.1080/00222930908692699 BHL Reference page. 

• Thomas, O. 1909. A collection of mammals from northern and central Mantchuria. Annals and Magazine of Natural History, series 8, 4(24): 500–505. DOI: 10.1080/00222930908692708 BHL Reference page. 

• Thomas, O. 1909. New African mammals. Annals and Magazine of Natural History, series 8, 4(24): 542–549. DOI: 10.1080/00222930908692715 BHL Reference page. 

• Thomas, O. & Dollman, G. [1908] 1909. On mammals from Inkerman, north Queensland, presented to the National Museum by Sir William Ingram, Bt., and the Hon. John Forrest. Proceedings of the Zoological Society of London 78(4): 788–794, pl. 43. DOI: 10.1111/j.1469-7998.1908.00788.x BHL Reference page. 

• Thomas, O. & Wroughton, R.C. 1909. [On a collection of mammals from western Java, presented to the National Collection by Mr. W. E. Balston]. Abstracts of the Proceedings of the Zoological Society of London No. 68: 18–19. BHL Reference page. 

• Thomas, O. & Wroughton, R.C. 1909. Two new macaques from W. Java. Annals and Magazine of Natural History, series 8, 3(16): 380–381. DOI: 10.1080/00222930908692596 BHL Reference page. 

• Thomas, O. & Wroughton, R.C. 1909. Diagnoses of new mammals collected by Mr. H. C. Robinson in the Malay Peninsula and Rhio Archipelago. Annals and Magazine of Natural History, series 8, 3(17): 439–441. DOI: 10.1080/00222930908692605 BHL Reference page. 

• Thomas, O. & Wroughton, R.C. 1909. On a collection of mammals from western Java presented to the National Museum by Mr. W. E. Balston. Proceedings of the Zoological Society of London 79(2): 371–392. DOI: 10.1111/j.1096-3642.1909.tb01875.x BHL Reference page. 

• Thomas, O. & Wroughton, R.C. 1909. Diagnoses of new mammals collected by Mr. H. C. Robinson in the islands of the Straits of Malacca. Annals and Magazine of Natural History, series 8, 4(24): 534–536. BHL Reference page. 

• Thomas, O. & Wroughton, R.C. 1909. On mammals from the Rhio Archipelago and Malay Peninsula collected by Messrs. H. C. Robinson, C. Boden Kloss, and E. Seimund, and presented to the National Museum by the Government of the Federated Malay States. Journal of the Federated Malay States Museums 4: 99–129. BHL Reference page. 

1912

• Thomas, O. 1912. Three small mammals from South-America. Annals and Magazine of Natural History ser. 8, 9:408-410.

1913

• Thomas, O. 1913. Notes on S. American Leporidæ. Annals and Magazine of Natural History, 8th Ser., 11(62):209–214. DOI: 10.1080/00222931308693309 . BHL. Reference page. 

1915

• Thomas, O. 1915: New African rodents and insectivores, mostly collected by Dr. C. Christy for the Congo Museum. Annals and magazine of natural history (8) 16(92): 146-152. DOI: 10.1080/00222931508693699 . BHL Reference page.