472 



PLEISTOCENE DEPOSITS. 



CHAP. 



If next we consider the shells, many of which belonged to residents 

 on the spot, a large list, including terrestrial, marsh, and aquatic 

 races, we find almost all to be living English species of Cyclas, 

 Pisidium, Unio, Anodonta, Paludina, Bithynia, Valvata, Planorbis, 

 Limnsea, Ancylus, Limax, Succinea, Zonites, Helix, Pupa, Vertigo, 

 Clausilia, Zua, and Carychium, but some belong to a different 

 category, as 



Cyrena (Corbicula) fluminalis. 

 Pisidium amnicum var. sulcatum. 

 Unio littoralis. 

 Hydrobia marginata. 

 Paludina contecta. 

 Valvata var. antiqua. 



Of the whole number (about fifty-seven species) twenty-four 

 or twenty-five k occur also in the Forest-bed of Norfolk, Paludina 

 contecta being one of them. These circumstances seem to agree 

 with the putting the lower brickearths within the glacial sera. 

 Lastly, the mammalian remains of these interesting deposits have 

 been carefully tabulated by Mr. Dawkins l : 



MAMMALIA OF THE LOWER BKICKEAKTHS OF THE 

 THAMES VALLEY. 



Bear Ursus arctos . . Ilford. 



Ursus ferox . . . Ilford. 



Wolf Ilford. 



Fox Canis vulpes . 



Hyaena spelaea . 



Felisspelaea .... Ilford. 



catus 

 Lutra vulgaris 



Bison priscus .... Ilford. 



Bos primigenius . . . Ilford. 



Megaceros Hibernicus . . Ilford. 



Cervus elaphus . . . Ilford. 



capreolus ... (?) 

 Ovibos moschatus . . 



Elephas antiquus . . . Ilford. 



primigenius . . Ilford. 



priscus m 



Equus fossilis .... Ilford. 



Grays. 

 Grays. 

 Grays. 

 Grays. 

 Grays. 

 Grays. 

 Grays. 

 Grays. 

 Grays. 

 Grays. 

 Grays. 

 Grays. 



Grays. 



Grays. 

 Grays. 



Crayford. 

 Crayford. 

 Crayford. 



Crayford. 

 Crayford. 



Erith. 



Erith. 



Crayford. Erith. 



k Mr. Alfred Bell has communicated to me a complete list of the shells, with 

 interesting remarks, which I hope may be speedily published. 

 1 Geol. Proc. 1867. This list has been revised by Mr. Dawkins. 

 m Admitted as a variety of E. primigenius by Falconer. 



