324
ON VALVATA WOODWARDI, N.SP., AND SPH^RIUM BULLENI,
N.SP., FROM THE CROMERIAN (FOREST BED) OF WEST
RUNTON, NORFOLK.
By A. S. Kennaed, F.G.S.
Bead 10th March, 1911.
DoKiNG the past few years a large quantity of material from the
Cromerian (Forest Bed) of West Runton, Norfolk, has been placed
at my disposal by M. A. C. Hinton, and 1 myself have also collected
from the same deposit. A close study of this has revealed the necessity
for a revision of the published lists of species, and considerable progress
has been made. Since, however, it is unlikely that this will be
finished for some little time I have considered it advisable to publish
descriptions of these two new species, since it is necessary to quote
them. The molluscan remains have been obtained from two distinct
layers just east of West Runton Gap. The uppermost bed is a sandy
gravel full of shells. It is about 8 inches thick and about 5 feet
above the level of the beach. There can be no doubt that this is the
bed described by Mr. Clement Reid ^ as — " Near West Runton Gap the
bed is a loamy sand full of Corhicula fliiminalis and Paludina gibba^
As a matter of fact Corbicula fluminalis does not occur, the shell which
has been mistaken for it being Sphc^rmm rwicola, Leach. The other
bed is one apparently older, and is a silty peat occurring on the
foreshore, more to the eastward. Mr. Hinton informs me that,
judging from the fossil Rodentia, there is considerable difference in
age between the two, the palseontological evidence supporting the
stratigrapliical. Both the new species were verj^ common in the upper
bed, though not so abundant in the lower.
Valvata Woodwaedi, n.sp.
Shell conical, solid, rather glossy, closely and finely striate in the
lines of growth ; whorls 4|-5, convex ; body-whorl verj-large ; apex
somewhat sharply pointed ; suture oblique, shallow ; mouth oval,
angulated above ; umbilical chink narrow ; operculum unknown.
Height 9, breadth 7 mm.
Locality/ and Formation. — West Runton, Norfolk : Cromerian
(Forest Bed).
^ Pliocene Deposits of Britain (Mem. Geol. Survey), 1890, p. 156.
BioStor
