Mr. Webster on the Strata lying over the ChalL 29A 



M. Brongniart mentions the following as being found in the 

 various beds of the upper marine marls. 



Cytherea (bom-bees) 



- - - plana 



- - - elegans 

 •» - - semisulcata 



Cerithium plicatuin 



- - - cinctum 

 Ampullaria patula 

 Cardium obliquum 

 Nucula margaritacea 

 Patella spirorostris — Cuv. p. 187. 



Ostrea Hippopus 



- - Pseudochama 



- - longirostris 



- - canalis 



- - cochlearia 



- - cyathella 



- - spatulata 



- - linguatula 

 Bones and parts of Fishes 



In the upper marine sand stones. 



Oltva mitreola 



Fusus, resembling longaevus 



Cerithium cristatum 



- - - lamellosum 



- - - mutabile ? 

 Solarium ? 

 Melania costellata ? 

 Melania ? 



Pectunculus pulvinatus 

 Crassatella compressa I 

 Donax retusa ? 

 Cytherea nitidula 



- - - Isevigata 



- - - elegans ? 

 Corbula rugosa 

 Ostrea flabellula 



I have already mentioned that considerable difficulties appear to 

 me to exist in assigning a place to the Woolwich beds. The actual 

 lowness of their level, appearing to dip under the London clay, 

 and their situation near the chalk without the intervention of that 

 bed, at first seem to determine their geognostic position. Whilst 

 the circumstances of their not being seen in any part covered by 



