[490]

Prouho, "Recherches sur le Dorocidaris papillata et quelques autres Échinides de la Méditerranée," Arch. Zool. Exp. (2) v. 1887, p. 308.

[491]

"Revision of the Echini," Illustrated Catalogue of Museum of Comp. Zool. Harvard, No. 7, 1874, p. 423.

[492]

British Museum Catalogue, "British Echinoderms," 1892, p. 30.

[493]

Loc. cit.

[494]

Loc. cit.