OXFORD CLAY. 



137 



Society, and others presented to me bymy friend Mr. Marshall. The same 

 museum contains a suite of fossils from the calcareous grit of Oxford- 

 shire, presented by Dr. Buckland, amongst which we recognise ammo- 

 nites vertebralis and pinna lanceolata. Ammonites vertebralis was 

 obtained by Mr. Smith from this rock at Deny -hill, Wilts, and pinna 

 lanceolata by Professor Sedgewick at Weymouth. In these instances 

 the zoological characters of a rock are shewn to be constant from one 

 end of the island to the other, though its thickness and mineralogical 

 appearance are subject to great variations, and in one example the 

 deposit is insulated and distant four hundred miles from its kindred 

 strata. The coralline oolite, (and calcareous grit ?) with pecten vimirialis, 

 ammonites plicatilis, &c. form the upper part of the Jura limestone of 

 Switzerland, and have been observed at several places on the north coast 

 of France. 



FOSSILS OF THE OXFORD CLAY. 



Mya. 1. literata 



MOLLUSCA. 

 . PI. VII. fig. 5. 



2. resembling mya depressa (Min. Conch, t. ccccxviii.) 



Sanguinolaria undulata (Min. Conch.) PL V. fig. 1. 



Crassina. 1. lurida (Min. Conch, tab. cxxxvii.) fig. 2. 



2. carinata ... ... fig. 3. 



Pholadomya obsoleta ... ... PL V. fig. 24. 



Modiola cuneata (Min. Conch, tab. ccxi.) PL V. fig. 28. 



(a large variety) 



Nucula. 1. elliptica ... ... PL V. fig. 6. 



2. (an inside cast) ... PL V. fig. 4. 



3. nuda (Young and Bird) ... PL V. fig. 5. 

 Cucullsea concinna ... ... PL V. fig. 9. 



Pinna mitis ... ... ... PL V. fig. 7. 



Trigonellites politus ... ... PI V. fig. 8. 



Plagiostoma. 1. with very fine striae PI. V. fig. 10. 



2. duplicatum ... PI. VI. fig. 2. 



T 



Scarborough, Ebherston, and 



in other strata. 

 Scarborough. 



Ditto, also in other strata. 

 Scarborough. 

 Ditto, also in calcareous 



grit, and Kelloways rock. 

 Scarborough, also in the 



Kelloways rock. 

 Scarborough, also iri other 



strata. 



Scarborough. 

 Ditto. 



Ditto (an inside cast.) 

 Scarborough. 

 Ditto. 

 Ditto. 

 Ditto. 

 Ditto, also in other strata. 



