Echini. The genus Colobocentrotus. (Reports on the scientific results of the expedition to the tropical Pacific, in charge of Alexander Agassiz, by the U. S. Fish Commisson steamer Albatross, from August, 1899, to March, 1900, Commander Jefferson F. Moser, U. S. N., commanding)DOI: info:10.5962/bhl.title.48983v. 39No. 11–8
Agassiz, Alexander. 1908. "Echini. The genus Colobocentrotus. (Reports on the scientific results of the expedition to the tropical Pacific, in charge of Alexander Agassiz, by the U. S. Fish Commisson steamer Albatross, from August, 1899, to March, 1900, Commander Jefferson F. Moser, U. S. N., commanding)." Memoirs of the Museum of Comparative Zoology, 39, (1) 1–8. https://doi.org/10.5962/bhl.title.48983.