366 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 26, 



clay immediately overljdng the mottled clays of tlie Isle of Wight, 

 have had a like and coeval origin, and that the London clay is conse- 

 quently lower in the series than the Bracklesham Bay beds, and still 

 more so than those of Barton. It is certainly possible that by greater 

 rapidity of formation the London clay and the so-called Plastic clay 

 of London might have expanded in the Hampshire district, so as to 

 have had for their equivalents the whole of the strata from the chalk to 

 the Freshwater series, including the Barton and Bracklesham beds. 

 Here however the organic remains come to our assistance, and tend 

 to strengthen our view, that the synchronism of the London clay ex- 

 tends only to the limits pointed out by similarity of structure. 



Owing to the want of sections intermediate between the Isle of 

 "Wight and London, there has existed some httle difficulty in esta- 

 blishing a satisfactory co-relation of the faunae of this division in the 

 neighbourhood of London with that which we take as its presumed 

 equivalent in Hampshire, but some recent railway cuttings have ma- 

 terially facilitated the inquiry. 



To render the palseontological evidence as clear and decisive as the 

 subject will admit of, and to show that each portion of it is in unison 

 with the whole, it will be desirable to study the organic remains in 

 groups, as they are developed in different places in each system, so 

 as to eliminate any modifications which they may undergo as they 

 approximate in geographical distribution, and to ascertain to what 

 extent the forms and species correspond. 



Commencing with the Isle of Wight we have the following group ; 



Fossils of the Bognor beds of White-Cliff and Alum Bays^. 



Anomia lineata, Sow. Pholadomya virgulosa, Sow. 



Cassidaria carinata, Lam. Pinna affinis, Sow. 



Cardium Plurasteadiense ?, Sow. n. s. — a large one, same as at 



Corbula pisum ?, Sow. Bognor and Cuffell. 



Cyprina planata, Sow. Psammobia compressa ?, Sow. 



Cytherea obliqua, JDesh. Pyrula tricostata, Desk. 



Ditrupa plana, Sow. Smithii, Sow. 



Dentalium. Plenrotoma. 



Fusus tuberosus, Sow. ■ (small species resembling one from 



angusticostatus, Mell. Southampton and Newnham). 



Infundibulum trochiforme. Sow. four or five other n. sp. 



Nucula lunulata ?, Nj/st. Kostellai'ia Sowerbii, Mant. 



" amygdaloides, Lam. lucida, Sow. 



Natica glaucinoides, Sow. Teredo antenauta, Sow. 



Ostrea flabellula, Lam. Turritella imbricataria, Besh. 



Panopsea intermedia, Sow. Venericardia Suessonensis, d'Archiac. 



Pectunculus brevirostris, Sow. Vermetus Bognoriensis, Sow. 

 Pholadomya margaritacea, Sow. 



* Mr. Edwards, who has just returned from the Isle of Wight, informs me that 

 he has, in addition to most of the specimens above mentioned, found the foUovring 

 ones in Stratum No. 4 of Alum Bay : — 



Acteon simulatus, Sow. Modiola depressa. Sow. 



Buccinum junceum. Sow. Nucula minima. Sow. 



Cassidaria striata, Sow. Solarium patulum, Sow. 



Cultellus affinis. Sow. Typhis muticus, Sow. 



Fusus Koninckii, Nyst. 



Marginella. Desmophyllum. 



All these are species which tend to confirm my views. — Oct. 1847. 



