134 CONCHYLIA— D/THYE^. 35. 



Shell half an inch long, and rather more in bi-eadth, yellowish- 

 white, somewhat oval and rather triangular, with numerous fine 

 laminar equidistant transverse ridges, which reflect a little, and in 

 both valves, at the cartilage side, become confluent in pairs, extend- 

 ing beyond the edges so as to form a fringe of short obtuse spines, 

 which turn back and form a cavity for the cartilage : beaks small, 

 nearly central, inclining a little to one side, with a long narrow im- 

 pression under them; inside smooth, white, with the margin plain. 



Young shells of the Venus Gallina something resemble it, the 

 transverse striae often shooting forward a little at the anterior edges, 

 as do those of Venus fasciata ; but the diff'erence of the teeth and 

 the laminar ridges distinguish them. 



35. CYPRINA— L^iVI^i^CA: 



Tenia subcordata, eequivalvis, subaquilateralis, clausa. Cardo dentibus 

 duobus vel tribus, superne divergentibus, cum laterali antico. Lign- 

 mentum externum. 



Shell someAvhat heart-shaped, cquivalve, nearly equilateral, closed. 

 Hinge with two or three teeth, divergent at their tops, and a la- 

 teral one at the anterior side. Ligament external. 



