FOSSILS OF THE CORNER ASH. 145 



Ostrea. 1. Marshii (Min. Conch, tab. xlviii,) ... Scarborough, Gristhorpe, 



Bedfordshire, Stc. 

 2. a small oval species ... Scarborough. 



Terebratula. 1. ovoides ? (Min. Conch, tab. c. ) 



. Ditto, Gristhorpe. 



also Young and Bird, tab. via. hg. 10.) 



2. digona (Min. Conch, tab. xcvi.) ... Scarborough, (rare,) also 



Wilts and Dorset. 



Trochus granulatus (Min. Conch, tab. ccxx.) ... Scarbro', and in other strata. 



Terebra? granulata ... PI. VII. fig. 16. Ditto. (Mr. Williamson.) 



Melania. 1. Heddingtonensis (Min. Conch, tab. xxxix.) Scarbro', Gristhorpe, Lin- 



colnsh. and in other strata. 



2. vittata ... fig. 15. Scarbro, Gristhorpe. (One 



specimen inclosed a mass 

 of crystallized blende.) 

 Bulla ? or Actaeon ? (which I have not seen ; it ) 



is in the collection of Mr. Preston) J Scarborough. 



Ammonites. 1. Herveyi (Min. Conch, tab. cxcv.) Ditto, and several places in 



Lincolnshire. 

 2. terebratus, similar but more globular spe- ) 



cies, with a very acute, narrow umbilicus j ou & ' 



(No belemnites have been found in the cornbrash of Yorkshire.) 



Vermicularia nodus ... ... PL IX. fig. 34. Ditto, and in the middle 



oolite. 

 Serpula intcstinalis .., ... PI. V. fig. 21. Scarborough, common. 



It is not so much by the presence of particular species of fossils which 

 are found in no other stratum, that the cornbrash can be accurately iden- 

 tified from Somersetshire to Lincolnshire, as by the occurrence together 

 in it of some fossils which are repeated in rocks above, and several others 

 which are found in those beneath. For, in the preceding list of thirty- 

 seven species obtained from this stratum in Yorkshire, nearly two-thirds 

 are certainly known to be repeated in other rocks, and possibly this 

 proportion may be increased by more scrupulous researches. But this 

 circumstance, whilst it confirms the inferences, derived from other con- 

 siderations, of the general analogy among all the members of the oolitic 

 formations on this coast, does not prevent the employment of zoological 

 characters, to discriminate the cornbrash from its associated rocks, though 



u 



