72 
Achatina acicula. 
H. (Zonites) alliarius. 
Bulimus obscurus. 
,, cellarius. 
Clausilia nigricans. 
,, crystallinus. 
Helix aspersa. 
,, nitidulus. 
,, cantiana. 
L'upa muscorum. 
,, caperata. 
Zua lubriea. 
„ bispida. 
Paludina 
,, nemoralis. 
Planorbis spirorbis. 
,, pulchella. 
Pisidium nitidum. 
,, rotundata. 
Limax cinereus. 
,, virgata. 
There is no evidence to shew when the English Channel 
finally opened up, beyond the suggestion of Mr. Grodwin- 
Austen, that if the Sangatte beds and the Combe rock are of 
the same period, it must have taken place after their formation. 
It may be worth noting that the flint implement found at 
Portslade, 15 feet deep in the Combe rock, is of a more 
modern type than those in the gravels, but less so than the 
tool of undoubtedly Cissbury manufacture now in the Brighton 
Museum and said to be from Selsey. Very little change has 
ensued in the relations of land to water since this event, 
beyond a slight elevation as seen in many places on the coast. 
One such occurs upon the banks of the Hayle River, Cornwall, 
from which 23 species were obtained. Its position at the base 
of, and covered by, the blown sands indicates its accumulation 
before the forming of the dunes probably on the upper margin 
of a wind swept beach. 
Buccinum undatum. 
Littorina littorea. 
,, obtusata. 
„ rudis. 
Patella vulgata. 
Purpura lapillus. 
Artemis lincta. 
Catdium edule. 
,, echinatum. 
„ tuberculatum. 
„ norvegicum. 
Cytherea cbione. 
The richness of the sandhills 
Lutraria oblonga. 
Mactra solida. 
Mytilus incurvatus. 
,, modiolus. 
Ostrea edulis. 
Pecten maximus. 
Pectunculus glycimeris. 
Venus fasciata. 
,, gallina. 
,, verrucosa. 
(Tapes) virginea. 
both in Cornwall and in the 
Roundstone Bay, County Gralway, is well known. The 
presence in each locality of certain forms of the common 
Helix nemoralis of a size and solidity now unknown, implies 
different conditions to those now prevailing. 
I have found marine shells on the right bank of the Fowey 
River, Cornwall, 3 miles from the sea, 5-6 feet above H.W. 
mark, and at Pegwell Bay, Kent, where the Thanet Sands 
slope to the shore, some low mud cliffs are now being eaten 
