+4 
exception, all such as could have been introduced by currents 
from the north, and if this should be borne out by further 
investigation, it Avill be interesting, as confirming the belief Avhich 
we have formed from geological reasons, that since the uprising of 
the land from the glacial sea, and the passing away of the glacial 
cold, there has never been that free communication between the 
German ocean and seas southward of this country Avhich prevailed 
during the submergence of the glacial period. And, in connection 
with this, it may be further remarked, that in the post-glacial 
gravels of the Cambridgeshire fens, intermediate between the 
glacial period and our own, we find a Molluscan fauna somewhat 
more northern than that of our present seas, containing Astarte 
horealis and one other arctic shell. 
I do not at present offer any further remarks, except to say that 
the coast from Wells to Hunstanton will best reward the collector, 
both as to abundance and diversity of specimens. The names 
given below are those adopted by Mr. Gwyn Jeffreys in his “ British 
Conchology,” the species which are most abundant on our shores 
being distinguished by an asterisk. 
LAMELLIBRANCHIATA— (BIVALVES). 
Anomia ephippium, Linn : 
J „ ,, var : aculeata. 
* Ostrea edulis, Linn: 
* Pecten varius, Linn : 
„ opercularis, Linn : 
Mytilus edulis, Linn : 
* „ modiolus, Linn: 
Modiolaria nigra, Gra.y. 
J ,, marmorata, Forbes. 
* Nucula nucleus, Linn : 
Leda minuta. Mailer. 
Montacuta bidendata, Montagu. 
J Kellia suborbicularis, Montagu. 
Lucina borealis, Linn : 
Cardium exiguum, Gmelin. 
„ fasciatum, Montagu. 
* „ edule, Linn: 
,, Horvegicum, Spengler. 
Oyster. 
Scallop. 
Mussel. 
Horse Mussel. 
Cockle. 
