Agassiz & Clark 1907. Preliminary report on the Echini collected in l906, from May to December, among the Aleutian islands, in Bering sea, and along the coasts of Kamchatka, Saghalin, Korea, and Japan, by the U. S. Fish Commission Steamer "Albatross," in charge of Lieut.-Commander L. M. Garrett, U.S.N., commanding. Bulletin of the Museum of Comparative Zoology at Harvard College, 51(pt. 5) 1907: (107-139)