BIVALVIA. 203 
Venus Literata. Linn. Faun Suec. non Syst. Nat. 
Capsa crocea. ‘Leach.’ Mag. Nat. Hist., vol. xx, p. 272. 
PuttastRa auREA. Alder. Catal. Moll. North. and Durh., p. 86. 
Taprs AuREA. Ford. and Hanl. Hist. Brit. Moll., vol. i, p. 392, pl. xxv, fig. 5, 1848. 
Spec. Char. Testa ovata, sub-cordatd, tumidiusculd, sub-inequilaterali, postice angulatd ; 
margine ventrali arcuato; concentricé sulcatd; striis radiantibus obsoletis; lunuld cordato- 
ovata. 
Shell ovate or heart-shaped, slightly tumid, inequilateral, posterior side angulated ; 
ventral margin convex, concentrically sulcated, with obsolete radiating striae; an 
elongated but not well-defined lunule. 
Length, \3th of an inch; eiyht, *ths ditto. 
Localities. Mam. Crag, Bramerton. 
Uddevalla. 
Recent, Norway, Britain, Mediterranean. 
The Mammaliferous Crag is its earliest appearance ; one specimen only is all that 
I have seen, and that was found by Mr. Wigham, near Norwich, who has obligingly 
permitted me to have it figured. In the recent state this is a common species in the 
British seas upon the Eastern Coast, where it is subject to considerable variation, both 
in regard to form as well as in the external ornament, some specimens being, in fact, 
smooth, while others are deeply sulcated, or covered with regular ridges over the 
entire surface. The strize upon the exterior of our solitary fossil specimen are fine and 
numerous; the anterior and posterior sides are somewhat compressed, while there is a 
tumidity about the middle of the shell differing therein from the preceding species, 
from which it also differs in being less elongated and rather less inequilateral. 
3. Tapes PEROVALIS, S. Wood. Tab. XIX, fig. 7 a—d. 
PULLASTRA PEROVALIS. S. Wood. Catalogue, 1840. 
Spec. Char. Testa elongato-ovatd, inequilaterali, tumidd, nitidd, politd, ten; anticé 
rotundato-angulata ; margine dorsali postico convexiusculo. 
Shell elongately ovate, inequilateral, tumid, smooth, glossy, and thin ; anterior side 
roundedly pointed ; dorsal margin slightly convex. 
Length, 2 inches; height, 1} inch. 
Locality. Cor. Crag, Ramsholt. 
I have obtained at the above locality about a dozen specimens of this species, 
which from loss of animal matter had become excessively fragile. 
In many of its characters it strongly resembles Venus geographica, but the smooth 
surface or total absence of the transverse ridges, as well as the radiating or decus- 
sating striae which ornament that species, will readily distinguish it. A shell figured 
and described by Phillippi from the Neapolitan seas, V’. ni¢ens, En. Moll. Sic., vol. ii. 
p- 35, t. xiv, fig. 14, seems to approach even nearer, and may probably be identitied 
