Clark, Hubert Lyman (1938). Echinoderms from Australia, an account of collections made in 1929 and 1932. Memoirs of the Museum of Comparative Zoology at Harvard College. Vol. 55. Cambridge, Mass.: Museum of Comparative Zoology. p. 42. BHLpage 4374202. [The "Mr. Clark" mentioned is probably Austin Hobart Clark.]