FOREIGN JURASSIC COLLYRITID^. 325 



CoLLYRiTES ORBiGNiANA, Cottcau. Echinidcs Foss. P]. IX, figs. 3 — 5. 



Test oval, cordiform, upper surface inflated, under surface flat ; the 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 incii 

 and one twentieth. 



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



Collection . — D ' Ormois. 



CoLLYRiTES LoRii, Albin Gras. 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, Cotteau. Echinides Foss. PI. XXXIX, fig. 1. 



Test large, oval, or snb-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. Cotteau. 



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



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



