Description: English: Plate I. 1., 2. Astropyga pulvinata, 3., 4. Arbacia dufresnii, 5.-7. Coelopleurus floridanus. Date: 1874. Source: Agassiz, A. & L. F. de Pourtales.
The The zoölogical results of the Hassler expedition, part 1: Echini, crinoids, and corals. Memoirs of the Museum of Comparative Zoölogy at Harvard College, Volume IV, Number 8. 1874. Author: Photographs by A. Sonrel.