248 
VENUS. 
each vajve, the middle ones a little cloven : length hardly 
three-quarters of an inch ; breadth a little more. 
It differs from V. aiireaj in its colors, in the angular out¬ 
line of the cartilage side, in not being regularly convex but 
merely tumid in the middle, and in sloping to a sharp edge 
fespeciallv on the angular side* 
In the blue clay of Clontarfj iii Ireland, v. m: 
34. Venus seined; Broiized Venus. Fig. 20. 
Shell oval, convex, brittle, rather thick, covered "frith a 
shining deep copper-colored skin under which it is chalky 
white, rounded at one end, regularly tapering and much 
produced at the other, where it is also founded, but not 
forming the least angle at the termination of the cartilage* 
with numerous close-set regular transverse stria?, and a 
few deep furrows at the margin, marked also with some 
very minute longitudinal Hues : beaks much pointed, near 
to and turning towards the larger end, with an elongated 
heart-shaped depression under them: teeth strong, two 
of them cloven in one valve and one in the oilier : inside 
white, with the margin rather obtuse aud 'plain : length an 
Inch; breadth one and a half. 
This beautiful species, so totally differing from all which 
we have examined, in its elegantly tapering shape and bright 
coppery skin, we found abundantly buried in the blue clay, 
at Clontarf near Dublin, v. in. 
35. Venus sinuosa. Indented Venus. 
Pennant , pi. 58. f. 4. 
Shell roundish-oval, a little produced at the posterior end 
and much broader on the cartilage side, yellowish white* 
glossy, marked With numerous broad and flat concentric 
l ibs, which dd not run into rough ridges or wrinkles at either 
of the sides* with ii deep depression in the middle forming 
an indentation on the front margin* and a corresponding 
ridge on the opposite surface : this sinuosity or cavity com¬ 
mences a little way from the beaks, and becomes bi'oader 
and deeper towards the margin; inside yellowish* with the 
margin plain and very obtuse : beaks quite central, rathef 
prominent* a little inclined to one side, with a heart-shaped 
depression 
