BIVALVIA. 183 
Spec. Char. Testd ovato-cordatd, sulcatd, subequilaterali, postice parim longiore, 
truncata, antice rotundaté ; margine crenulato, vel levigato. 
Shell ovately heart-shaped, sulcated, nearly equilateral, posterior side a little the 
onger, anterior rounded ; margin crenulated, or smooth. 
Length, ‘ths of an inch; height, sths ditto. 
Localities. Red Crag, Sutton. 
Mam. Crag, Bridlington (Forées), Bramerton. 
Clyde Beds. Recent, Britain, Finmark, North America. 
As a Crag shell this is very -rare; my cabinet contains a few specimens from 
Suffolk, and several of those are quite young, having the margin free from crenulations; 
” the one figured is, no doubt, of this species, but differs rather from the generality 
of specimens now found living in the British seas, and resembles the one given by 
Middendorf, more especially figs. 1—8, the latter figure being probably only the 
mature state of the former. 
10. AsTaRTE compressa, Montague. Tab. XVI, fig. 8 a—c. 
VeNUs compressa. Mont. Test. Brit. Suppl., p. 43, t. xxvi, fig. 1, 1808. 
— Monracurr. Dillw. Dese. Cat. Rec. Shells, p- 167, 1817. 
— Montacut. W. Wood. Ind. Testaceol., p- 34, pl. vii, fig. 19, 1825. 
Nicanta Banxsir. Leach. Ann. of Phil., vol. xiv, p- 204, 1819. 
— STRIATA. Id. % vol. xiv, p. 204, 1819. 
Cyprina compressa. Turt. Brit. Biv., p. 136, pl. xi, figs. 22, 23, 1829. 
Crassina striata. Brown. Illust. Brit. Conch., pl. xviii, fig. 8, 1827. 
—_ OBLIQuA. Id. 7 5 pl. xviii, fig. 6, 1827. 
— CONVEXIUSCULA. Tee 3 pl. xviii, fig. 7, 1827. 
— MULTICOSTATA. Smith and Brown. Mem. Wern. Nat. Hist. Soc., vol. Vili, p. 56, 
pl. i, fig. 20, 1838. 
— ComPREssA. Thorpe. Brit. Mar. Conch., pp- 80 and 247, 1844. 
— Montacur. Gray. Ann. of Phil., 1825, p. 136. 
ASTARTE ANGULATA. Woodward. Geol. of Norf., p. 43, ¢. ii, fig. 17, 1832. 
— striata. Brown. Ilust., 2d ed., p. 96, pl. xxxviii, figs. 6, 7, 8. 
_ — Miller. Ind. Moll. Groenl., p- 20, 1842. 
— — Lovén. Ind. Moll. Scand., p- 37, 1846. 
= — Gray. Append. to Beech Voy. Zool., p. 152, t. xliy, fig. 9. 
— Banxsi. Id. ae 5 p- 38, t. xliv, fig. 9, 1842. 
—_ — Miller. Tnd. Moll. Groenl., p. 20, 1842. 
— ComPREsSA. Forb. and Hanley. Hist. Brit. Moll., vol. i, p- 464, pl. 30, figs. 1—3, 
1848, 
— a Middendorf. Mém. de V Acad. St. Petersb., p. 560, 1849. 
—  MULTICosTATA. Macgill. Moll. Aberd., p- 260, 1843. 
= = Phil. Neuer Conebyl., vol. ii, p. 59, pl. i, fig. 8. 
— PULCHELLA (Jonas) Phil. Id. (fide Middendorf.) 
Spec. Char. Testa rotundato-trigond, subequilaterali, nonnihil obliqua, deformi, 
postice latiore, sulcatd, vel dense striatd, margine dorsali conveaxiusculo, margine ventrali 
entegerrimo. 
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