1847.] PRESTWICH ON THE LONDON CLAY. 371 



Fossils from the London Clay at Newnham^ between the Winchjield 

 and Basingstoke stations. 



Anomia lineata. Ostrea flabellula, Lam. 



Acteon simulatus, Sow. Cymbula ?, Desk. 



Avicula media, Sow. Panopsea intermedia, Sow. 



Ancillaria (same sp. as at Highgate). Pholadomya margaritacea, Sow. 



Buccinum junceum. Pinna aflSnis, Sow. 



Cardium nitens, Sow. Pleurotoma rostrata, Sow. 



Plumsteadiense ?, Sow. — — (two new species). 



Cancellaria laeviuscula. Sow. Pseudoliva obtusa, Svw. 



Cassidaria earinata, Lam. Pyrula Smithii, Sow. 



Cyprina planata, Sow. tricostata, Desh. 



Cytberea obliqua, Desh. Rostellaria Sowerbii, Mant. 



suberyeinoides, Desh. var. lucida, Sow. 



Ditrupa plana, Sow. Ringicula turgida, Sow. 



Fusus bulbiformis, Lam. Solen affinis, Sow. (Cultellus). 



errans, Sow. Teredo antenauta, Sow. 



tuberosus. Sow. Terebratula striatula, Mont. 



Globulus depressus, Sow. Turritella imbricataria. Lam. 



Lingula tenuis. Sow. sulcifera ?, Lam. 



Modiola elegans, Sow. Vermetus Bognoriensis, Sow. 



subcarinata, Sow. Venericardia. 



Nautilus imperialis. Sow. Voluta elevata. Sow. 

 Natica glaueinoides, Sow. Serpula extensa, Brand. 

 Hantoniensis, Sow. sm^H. ,fi Teeth of Lamnae. 



These fossils are imbedded iii &,' dark grey sandy clay, frequently 

 containing numerous small round black flint pebbles. The shells 

 are well-preserved, and most of them have attained a large size. The 

 Cyprina planata especially are very large. Some of the Septaria 

 are full of Modiola and Cardium. These three, together with the 

 Turritella imbricataria, Ostrea Jlabellula, Cytherea obliqua, and the 

 two species of Natica, are the common shells. Fossil wood pierced 

 by the Teredo is plentiful. 



In the small number of sections which have been exposed between 

 Newnham and London, the fossils have been found to agree either 

 with those of the above, or with others occurring at Hampstead or 

 Highgate. But we need not, for our object, go further than Newn- 

 ham, since from thence to Highgate the London clay ranges unin- 

 terruptedly. This point can therefore be taken as a fit term of com- 

 parison between the fauna of these beds in the neighbourhood of 

 London* and those in Hampshire f. 



* Mr. Wetherell has found at the base of the London clay at Hampstead a con- 

 glomerate bed similar to that of Clarendon, and analogous to the unindurated 

 layers at Chinham, and containing like them the Rostellaria Sowerbii, Natica 

 glaueinoides, Cytherea obliqua, and Pectunculus brevirostris (Trans. Geol. Soc. 

 2nd Series, vol. v. p. 133). Mr. Warburton also gives an analogous group of fossils 

 from a similar position at the base of the London clay at Holyport, near Maiden- 

 head (Trans. Geol. Soc. 2nd Series, vol. i. p. 52). Mr. Rolfe has the same from 

 Reading (Trans. Geol. Soc. 2nd Series, vol. v. p. 130). I have the same species 

 from Sonning near Reading, and many other places ; in all of them, as a group, 

 there is a perfect identity. 



t From Newnham to Old Basing the London clay can be followed, with little 

 interruption, to the mottled clays over the chalk, and in the opposite direction 

 it dips under the Bagshot sands at Winchfield. Newnham seems to occupy a 

 place rather high in the middle of the series. From Old Basing, however, west- 



