358 FOREIGN JURASSIC ECHINOBRISSI. 



EcHiNOBRissus GRACILIS, Affttss. Syn. Nucleolites gracilis, Agassiz, Echinoderm. Foss. 



Suisse, part i, pi. vii, figs. 10 — 12, p. 44. 



A small, beautiful nucleolite, rounded before, abruptly enlarged behind the disc, 

 emarginated and truncated posteriorly ; ambulacra very narrow ; anal valley wide and 

 deep; mouth-opening very excentral near the anterior border; summit slightly excentral. 



Dimensions. — Height, half an inch ; length, seven tenths of an inch ; breadth at the 

 widest part, nearly equal to the length. 



Formation. — Portlandien inferieur (Astartien) de Rsedersdorf Haut Rhin, Porrentruy. 



Collection. — M. Gressley. Very rare. 



B. — Species in which the anal valley does not extend to the apical disc. 



EcHiNOBRissus GoLDFUSSii, BcsmouUns. Syn. Echinobrissus Goldfussi, Cotteau and 



Triger, Echinides de la Sarthe, pi. xix, 

 figs. 1, 2, p. 86. 



A small nucleolite, rounded before, sub-truncated and slightly dilated behind ; upper 

 surface convex and inflated ; much sloped from the summit to the posterior border ; base 

 flat, vertex excentral and anterior; anal valley short, wide, and deep, arched above, 

 expanded below, extending one third of the distance between the border and disc ; vent 

 elliptical near the surface ; mouth-opening anteriorly excentral ; peristome pentagonal. 



Dimensions. — Height, half an inch ; length, nineteen twentieths of an inch ; breadth, 

 nearly eight tenths of an inch. 



Formation. — Kelloway ferrugineux, Montbizot, Department of the Sarthe, Largues 

 (Haut Rhin) ; Launoy (Ardennes) ; Etage Oxfordien. 



Collections. — MM. Cotteau and Triger. 



Echinobrissus pulvinatus, Cotteau, Echinides de la Sarthe, pi. xix, figs. 3, 4, p. 87. 



A moderate sized, oblong nucleolite, round before, sub-truncated behind, thick and 

 inflated at the borders, depressed at the upper surface ; base sub-concave and slightly 

 undulated ; apical disc sub-central, nearer the anterior border ; anal valley far removed 



