FOREIGN JURASSIC COLLYRITIDtE. 325 



CoLLYRiTES ORBiGNiANA, Cottcau. Ecliinides Foss. PI. IX, figs. 3 — 5. 



Test oval, cordiform, upper surface inflated, under surface flat ; tlie posterior ambulacra 

 ascend in nearly a straight direction, and meet above the vent. 



Dimensions. — Height, three quarters of an inch ; breadth, one inch ; length, one inch 

 and one twentieth. 



Formation. — Oxford-clay of Stingy, (Yonne). Rare. 



Collection. — D 'Ormois. 



CoLLYRiTES LoRYi, AlMn Grus. Catal. des Foss. de PIsere, tab. ii, figs. 1 — 3. 



Test elongated, contracted behind ; the posterior ambulacra rise high up on the dorsal 

 surface, as in C. bicordata, but the ambulacral areas are narrower. 



Formation. — Corallian d'Echaillon (Isere). Rare. 



Collection. — M. Albin Gras. 



CoLLYRiTES Desoriana, Cottcau. Ecliinides Foss. PI. XXXIX, fig. 1. 



Test large, oval, or sub-elongated ; anterior border with an anteal sulcus ; posterior 

 border obtuse ; convex and depressed on the upper surface, flat on the under surface ; the 

 three anterior ambulacra narrow, anterior pair flexed ; summit nearly central ; posterior 

 ambulacra converge at a considerable distance above the vent. 



Dimensions. — Height, thirty-three millimetres ; breadth, seventy-four millimetres ; 

 length, eighty -seven millimetres=three inches four tenths. Cotteaic. 



Formation. — Inferior Corallian of Chatel-Censoir, and Druyes, (Yonne). 



Collection. — M. Cotteau ; known only as a sihceous mould, and in general deformed. 



