Downey, M. E. 1968. Catalogue of Recent Echinoid Type Specimens in the U.S. National Museum Smithsonian Institution and the Museum of Comparative Zoology Harvard University. United States National Museum Bulletin 264, v-vi, 1-99.
Catalog of Recent Echinoid Type Specimens in the U.S. National Museum, Smithsonian Institution, and the Museum of Comparative Zoology, Harvard University