1909

• Clark, H.L. 1909. Notes on som Australian and Indo-Pacific echinoderms. Bulletin of the Museum of Comparative Zoology. 52: 107-135. BHL Reference page. 

• Clark, H.L. 1909. Scientific results of the trawling expedition of H.M.C.S. "Thetis" off the coast of New South Wales, in February and March, 1898. Echinodermata. Australian Museum Memoir. 4(11): 519-564. BHL DOI: 10.3853/j.0067-1967.4.1909.1507 Reference page. 

1911

• Clark, H.L. 1911. North Pacific Ophiurans in the collection of the United States National Museum. Bulletin of the United States National Museum. 75: 1-302. BHL Reference page. 

1915

• Clark, H.L. 1915. Catalogue of recent ophiurans: based on the collection of the Museum of Comparative Zoölogy. Memoirs of the Museum of Comparative Zoology. 25(4): 163-376, 20 pls. BHL Reference page. 

1918

• Clark, H.L. 1918. Brittle stars, new and old. Bulletin of the Museum of Comparative Zoology. 62(6): 263-338, 8 pl. BHL Reference page. 

1921

• Clark, H.L. 1921. The echinoderm fauna of Torres Strait: its composition and its origin. Department of Marine Biology of the Carnegie Institute (10). BHL Reference page. 

1923

• Clark, H.L. 1923. The Echinoderm fauna of South Africa. Annals of the South African Museum. 13(7): 221-435, pls VIII-XXIII. BHL Reference page. 

1938

• Clark, H.L. 1938. Echinoderms from Australia, an account of collections made in 1929 and 1932. Memoirs of the Museum of Comparative Zoology. 55: 1-597, 28 pls. BHL Reference page. 

1939

• Clark, H.L. 1939. Ophiuroidea. The John Murray Expedition 1933-34. Scientific reports. London: The Trustees of the British Museum. 6: 29-136. Reference page.