104 PROF. J. PEESTWICH OX THE CORPvELATIOX OF THE 



D. SJielJs of the Basement-hed ^x. (continued). 



Thanet 

 Sands. 



Woolwich 

 Beds. 



London 

 Clay. 



Brought forward 



Qyfjj^gj'gg^ orbicularis Edw 



3 



* 



* 



10 



■5S- 

 * 



* 

 * 



* 



* 



* 



5 



* 

 * 



* 

 * 



* 



* 

 * 



* 

 * 



* 



* 

 * 



* 

 * 

 * 



ovalis, Shy. (? orbicularis). 



Lithodomus, sp. ? 



Modiola depressa, Sby 



elegaus, *S6y 



— Mitchelli Morr 



Nucula Bowerbankii, Sby. ? 



margaritacea, var., Bes-h.'l... 





Panoprea intermedia, Shy 



Pecten, sp. 



Pectunculus brevirostris, Shy. . . . 



decussalus, Shy 



plumsteadiensis, Sby 



terebratularis LainJc 







Solen, sp. 



Teredo antenautee, Shy 



Actaeon, sp. 



Aporrhais Sowerbyi, Mant. ...... 



T?nr«pirmTn iimr^PinTi Shu 







*? 



Ca^yptrsea trochif'ormis, Larak. ... 



Caneellaria IjEYiuscula, Shy 



Cassidaria nodosa, Brand 



Cerithium variabile, Desk. (C. " 



funatum, Mant.) ' 



^''usiis comijlanatus Shu, . ... 



subnodosus, Morr 



tuberosus, Shy 



Melania inquinata, Defr 



* 



! 



* 



1 



i 



1 

 1 



Natica hantoniensis, Shy 



labellata, Lam. (N. glau- 



cinoides, Shy.) 



subdepressa 



Pleurotoma comma, Sby. ? 



acuminata, Edw 



Pyrula Smithii, Shy 



— — tricostata, Desk 



noduhfera, G. B. Sby. 



Sealaria, sp. 



Turritella, sp. 



Yoluta denudata. Shy 



Ditrupa plana, Shy 



Lingvda tenuis, Sby 



1 9 



1 



23 



30 



! 



The proportion of London-Clay species is therefore much larger 

 than in the Woolwich Beds, in the ratio of 30 to 14, and, if we 



