262 Mr. De la Beche on the GeographicalDistribution qfOrganic 



Of the 63 species of fossils enumerated in the Oxford clay 

 of Yorkshire, more than one half are new : but of the re- 

 mainder, 12 occur in the other localities; of these, 8 are 

 mentioned in Mr. Conybeare's lists, 7 are discovered in Nor- 

 mandy, and 2 in the North of France. 



Of the 16 species noticed in Mr. Conybeare's lists of Mid- 

 land and Southern England, 1 1 are found in the other loca- 

 lities, and of these, 8 occur in Yorkshire, 7 in Calvados, and 

 1 in the North of France. 



Of the 34 species enumerated in Calvados, 12 are found in 

 the other localities ; and of these, 7 are discovered in York- 

 shire, 7 in Midland and Southern England, and 4- in the 

 North of France. 



Of the 1 1 species, not questionable, mentioned as found in 

 the North of France, 4 are discovered in the other localities ; 

 and of these, 2 occur in Yorkshire. 



It will be observed that the Gryphaea dilatata is found in 

 all the localities ; and that Ammonites Duncani, A. sublsevis, 

 and Terebratula ornithocephala, are common to England and 

 Normandy. 



Subdivision : Coral Rag, Oxford Oolite, and Calca- 

 reous Grit. 

 Organic Remains of the lower Calcareous Grit of Yorkshire.* 



Dicotyledonous Wood. 



Spongia. 



Crinoidal columns. 



Echinus germinans. 



Cidaris vagans. 



Spatangus ovalis. 



Clypeaster pentagonalis (Phil.)- 



Galerites depressus. 



Pholadomya simplex (Phil.). 



deltoidea ? 



Sanguinolaria undiilata. 

 Mya literata. 

 Isocardia tumida (Phil.). 

 Crassina carinata ? 

 ^'enus. 



Lucina crassa. 

 Modiola bipartita. 

 Avicuia ovalis (_Phil.). 

 Lima mdis. 



Gryphaea bullata ? 



chamaaformis. 



inhaerens. 



Ostrea grcgarea. 

 Terebratula socialis. 

 Cirrus cingulatus (Phil.). 

 Actaeon retusus (Phil.). 

 Turritella muricata. 

 Rostellaria bispinosa? (Phil.). 

 Trochus granulatus. 

 ■ bicarinatus. 



Belemnites sulcatus. 

 Ammonites Sutherlandise ? 



perarmatus. 



— ^^— — instabilis. 



Solaris (Phil.). 



vcrtebralis. 



Dentalium. 



Serpula lacerata (Phil.). 



Organic Remains of the Coralline Oolite of Yorhhire.f 



Astacus rostratus (Phil.). 

 Spongia floriceps (Phil.). 

 Turbinolia dispar (Phil.). 



Dicotyledonous Wood 

 Crocodile. 



Ichthijosaurits. 

 Palatal teeth of Fish 



' Phillips's Geology of Yorkshire, p. 134— 13G. 



Caryophyllia cylindrica (Phil.). 



\md. p. 126-132. 

 Caryophyllia, 



