Reports on an exploration off the west coasts of Mexico, Central and South America, and off the Galapagos Islands, in charge of Alexander Agassiz, by the U. S. Fish Commission Steamer "Albatross," during 1891, Lieut. Commander Z. L. Tanner, U. S. N., commanding, xii. The Holothurioidea. Memoirs Museum Harvard, xvii(No. 3) 1894: 183 pp.. 100 [Zoological Record Volume 31]