270 FOREIGN JURASSIC HOLECTYPI. 



Holectypus punctulatus, Desor. Monogr. des Galerites, tab. 9, figs. 17 — 19. 



Test hemispherical, sides tumid ; tubercles form regular, horizontal, and vertical 

 series, ten rows in the inter-ambulacra, and six rows in the ambulacra, which are much 

 more developed at the base ; mouth small, vent large, between that opening and the border. 

 This species has many important affinities with the preceding, and is only distinguished 

 from it, according to M. Desor, by having fewer tubercles, which are arranged with 

 greater regularity. 



Dimensions. — Height, four tenths of an inch ; transverse diameter, eight tenths of 

 an inch. 



Formation. — Corallien inferieur de Largue (Canton de Berne), Dettingen, Wurttemberg, 

 Mont-de-Bregille (pres Besancon). Oxfordien de Chambery. Renevier. 



Collections. — MM. Gressly, Parandier ; Count Mandelslohe. Abundant. 



Holectypus corallinus, d'Qrbig. Cotteau, Etudes sur les Echinides Foss., pi. 32, 



figs. 1—8. 



Test sub-pentagonal, sub-conical above, flat or sub-concave below; tubercles disposed 

 in regular, vertical, and concentric series, a single longitudinal row on each plate, small 

 and few in number on the upper surface, large and numerous at the circumference 

 and base, about twelve in the widest part of the inter-ambulacra. Granules unequally 

 scattered on the surface of the plates. Mouth central, peristome deeply notched; vent 

 large, elliptical, between the mouth and the border. 



Dimensions. — Height, eleven twentieths of an inch ; transverse diameter, one inch and 

 a quarter. 



Formation. — Corallien 14 e etage, d'Orbig. ; Druyes, Chatel-Censoir (Yonne). 

 Kimmeridgien 15 e etage. Pointe-du-Che (Yonne). Cotteau. 



Collections. — MM. Cotteau, d'Orbigny. Abundant. 



