Venus. 
23S 
heart-shaped depression under them, which with the carti¬ 
lage slope is purple: hinge with three teeth in one valve, 
one of which stands transversely 5 in the other valve three, 
besides a prominence on the side of the cavity which re¬ 
ceives the transverse tooth of the opposite valve: length 
an inch and a quarter ; breadth one and a half. 
In its contour it much resembles the V. Gullina; but dif¬ 
fers in the teeth, in- having the ridges much more raised 
and sharp-edged, lying over each other in a kind of imbri¬ 
cate manner, and' in the margin being quite plain. 
Dredged in the Firth of Forth : very rare. 
14. Venus triangularis. Triangular Venus* 
Montagu, pi. 17* f-'3. 
Shell strong, roundish and somewhat triangular, equally 
sloping on each side from the beaks, marked only with a 
few antiquated ridges, of a dull yellowish-white color ; in¬ 
side smooth, with the margin plain : beaks projecting in a 
rather acute angle, giving the shell a somewhat triangular 
outline, central, turning a little obliquely, with a lanceolate 
depression under them i hinge strong, with two teeth and 
a lateral semilunar lamina in one valve, one of the teeth 
cloven, the other triangular and placed near it, the semi¬ 
lunar lamina running parallel with the heart-shaped depres¬ 
sion, its convexity pointing inwards* between which and the 
margin is a deep groove ; in the other valve three teeth* 
two of which diverge much, in order to admit the triangu¬ 
lar central tooth of the opposite valve, and a lateral one 
locking between that and the marginal edge : length and 
breadth about half an inch. 
Devonshire const, and Dublin bay : rare. v. m. 
9 15. Venus Islandica. White Clam. 
Lister , pi. 2/2. f. lOS-t—Pennant, pi. 56 —Da Cosfa t 
pi. 14. f. 5— Donovan, pi. 77— Linn. Trims . vi. pi. 17. 
f. 1, 2— Dorset Cat . pi. 6. f. 5* ( 
Shell strong, thick, convex, rounded, a little produced 
and sloping on the cartilage side, covered when fresh with 
a glossy yellowish-brown or dusky skin which is finely stri¬ 
ate transversely, under which it is dull white and irregularly 
striate; inside pure chalky-white, not glossy, with the margin 
plain 
