59 
VENUS equalis. 
TAB. XXI. 
Spec. Cuar. Uniformly convex, obcordate or 
nearly circular, covered with numerous trans- 
verse concentric striw; thick, particularly in 
the middle; margin acute, extended, entire. 
Cicatrix obscure. 
(Lenatu and breadth nearly equal; a shell of three or four 
inches in diameter, is about half an inch thick; the anterior 
side rather rugged; striw projecting, sharp. I received 
specimens of these some years since, by favour of the Rey. 
P. Lathbury, from Woodbridge in Suffolk; gathered in 
the cragg-pits. Dawson Turner and William Hooker, 
Esqs. have also favoured me with fragments. The two 
upper figures are from one specimen from Elmset, by 
favour of the first Gentleman; it is the most perfect I have 
seen. The fragment below is part of a larger shell, and 
shows the opposite hinge, and at the same time a wearing 
at the cavity where the cartilage probably was fixed, by 
which it is remarkably enlarged near the beak of the shell; 
besides some wearing about the rest of the hinge part, 
almost enough to make some think it another species. I 
have received a fragment of this and another species of 
similar proportions, much resembling Venus Islandica of 
Linn. from Holywell near Ipswich, found in a cragg pit on 
Mr. Cobbold’s estate. These shells are mostly the Carbo- 
nate of Lime remaining from the recent shell, more or less 
coloured by ochraceous oxide of Iron; they are generally 
thick, particularly in the middle, and are of a thickly plated 
