12 
cumstance that, however curious and difficult to account 
for, is not uncommon), and from some detached indivi- 
duals that were collected at Kast Peckham in Kent by 
J.B. Dorient, Esq. Although we cannot detect the Cy- 
pris among these, we suppose they come from the beds 
of Limestone subordinate to the Weald Clay : some 
fragments of the fibrous carbonate of lime resembling 
“Curl” mentioned by Dr. Fitton (p. 374, note) occur 
with them. 
PALUDINA carinifera. 
TAB. DIX.—fig. 3. 
Spec. Cuar. Ovato-conical, smooth ; volutions 4, 
convex, the upper two bounded by a linear 
keel at the lower edge. 
Nor much longer than wide, and rather blunt; the 
thread that runs round the sutures of the two upper 
whorls is a strong character. 
From one of the upper beds of Purbeck Limestone. 
In the interior of the mass the shells are more complete- 
ly crushed than in that from East Peckham just men- 
tioned: it contains fragments of some bivalve. 
The insulated figure is taken from parts of several in- 
viduals. 
In the Sandstone at Hollington near Hastings, and in 
other parts of the Hastings Sands, there occurs a Paludina 
of nearly the same proportions as the one before us; but 
as we have only seen casts, we cannot determine the 
species. 
