Agassiz, A. (1898). Reports on the dredging operations off the west coast of Central America to the Galápagos, to the the west coast of México, and in the Gulf of California, in charge of Alexander Agassiz, carried on by the U.S. Fish Commission Streamer "Albatross", during 1891, Lieut. Commander Z. L. Tanner, U.S.N., Commanding. XXIII. Preliminary report on the Echini.
Bulletin of the Museum of Comparative Zoology. 32, 71-86.
