FOREIGN JURASSIC ECHINOBRISSI. 857 



EcHiNOBRissus AMPLUS, Agttss. Syn. Nudeolites amplus, Agassiz, Catal. raisonne, p. 96. 



" A large species, as broad as it is long, convex above, and nearly square ; posterior 

 border declined, thin, and emarginate ; anal valley extending to the ambulacral summit, 

 which is central ; base concave ; mouth-opening excentral." Desor, 



Formation. — " Marnes a Discoidees (Vesulien) de Wolfliswyl (Argovie) ; Val de Laufen- 



Collections. — Moesch, Mus. Bale. Coll., Gressly. 



EcHiNOBRissus PLANULATUS, Roemer. Syn. Nudeolites planulatus, Roemer, Oolit. 



Gebirges, pi. i, fig. 19, p. 28. 



A small elongated nucleolite, remarkable for its extremely depressed dorsal surface ; 

 it is rounded before, truncated behind, and has the posterior border slightly emarginated. 



Formation. — Upper Coral Rag of Lindner Barges (Hanover). 



Collections, — M. Roemer. My cabinet, specimen sent by Professor Roemer. 



ECHINOBRISSUS MAJOR, Agass. Syn. Nudeolites major, Agassiz, Echinoderm. Foss. Suisse, 



part i, pi. vii, figs. 22 — 24, p. 46. 



A large, quadrate, elongated nucleolite, rounded before, enlarged behind, having the 

 posterior border truncated, and strongly emarginated ; base concave ; mouth pentagonal, 

 and near the anterior margin. 



'D* 



Dimensions. — Height, seven tenths of an inch ; length, one inch and three tenths ; 

 breadth, one inch and three twentieths. 



Formation. — " Portland infcrieur (Astartien Oolitique) de Laufon avec Pygurus 

 Ilartmanni, Delemont (Jura Bernois)." Desor. 



Collection. — M. Gressley, 



