PLEISTOCENE GEOLOGY OF THE THAMES VALr.EV. 355 



Helix nemoralis, Linn. Two imperfect examples and 

 numerous fragments. 



Helicella virgata, Da Cost. Four examples. The 

 occurrence of this species is of great interest, as hitherto it is 

 only represented from the Pleistocene of the Thames \"alley by 

 a single example found at Ilford by Dr. Frank Corner, and now 

 in the Natural History Museum. Elsewhere it was common at 

 Barnwell, and it has been found in several rainwashes of uncer- 

 tain age, probably very modern, if not post-Roman. 



Helicella itala, Linn. Not found by us, but a single 

 example was found by W. J. Lewis Abbott, F.G.S., in the pit 

 belonging to the Tunnel Cement Works Company. It differs 

 markedly from typical examples of this species, but it can only 

 be considered a variety. Several examples of this variety have 

 lately been obtained from Ilford by J. P. Johnson and G. White 

 (see Essex Nat., vol. xi., p. 159). 



Helicella caperata, Mont. Three examples of this 

 abundant Pleistocene shell. 



Cochlicopa lubrica, Miill. One perfect and two broken 

 specimens. 



Pupa muscorum, Linn. Not common. This is note- 

 worthy as it is usually one of the most abundant land shells in 

 Pleistocene deposits. 



Vertigo antivertigo, Drap. Five examples. This species 

 was recorded by S. V. Wood, but hitherto no examples were 

 known. 



Vertigo substriata, Jeff. Recorded by A. Tylor on the 

 authority of A. Bell. 



Vertigo pusilla, Mull. Recorded by S. V. Wood. 



Clausilia laminata. Mont. Several fragments. It has 

 hitherto been unrecorded from Grays. It is known from the 

 Pleistocene of Ilford, Clacton, Copford and Ightham, whilst 

 it is abundant in many Holocene beds. 



Clausilia biplicata, Mont. Several imperfect examples. 

 Though originally listed by S. V. Wood this record has hitherto 

 been rejected since the species was unknown in a fossil state 

 in this country (there being no examples of it in the Wood 



