BIVALVIA. 183 



Spec. Char. Testa ovato-cordatd, sulcata, subcsquilaterali, postice parum longiore, 

 truncatd, antice rotundatd ; margine crenulato, vet lavigato. 



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, fths ditto. 



Localities. Red Crag, Sutton. 



Mam. Crag, Bridlington {Forbes), 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 — 3, the latter figure being probably only the 

 mature state of the former. 



10. AsTARTE coMPRESSA, Moutugue. Tab. XVI, fig, 8« — c. 



Venus compressa. Mont. Test. Brit. Suppl., p. 43, t. xxvi, fig. 1, 1808. 



— MoNTACXJTi. Billw. Desc. Cat. Rec. Shells, p. 167, 1817. 



— MoNTAGUi. W. Wood. Ind. Testaceol., p. 34, pi. vii, fig. 19, 1825. 

 NiCANiA Banksii. Leach. Ann. of Phil., vol. xiv, p. 204, 1819. 



— STRIATA. Id. „ vol. xiv, p. 204, 1819. 



Cyprina compressa. Turt. Brit. Biv., p. 136, pi. xi, figs. 22, 23, 1822. 

 Crassina striata. Brown. Illust. Brit. Conch., pi. xviii, fig. 8, 1827. 



— OBLIQUA. Id. „ „ pi. xviii, fig. 6, 1827. 



— coNVEXiuscuLA. Id. „ „ pi. xviii, fig. 7, 1827. 



— MULTicosTATA. Smith and Brown. Mem. Wern. Nat. Hist. See., vol. viii, p. 56, 



pi. i, fig. 20, 1838. 



— COMPRESSA. Thorpe. Brit. Mar. Conch., pp. 80 and 247, 1844. 



— MoNTAGUi. Gray. Ann. of Phil., 1825, p. 136. 



AsTAETE ANGULATA. Woodward. Geol. of Norf., p. 43, t. ii, fig. 17, 1832. 



— STRIATA. Brown. Illust., 2d ed., p. 96, pi. xxxviii, figs. 6, 7, 8. 



— — Moller. Ind. Moll. Groenl., p. 20, 1842. 



— — Loven. Ind. Moll. Scand., p. 37, 1846. 



— — Gray. Append, to Beech Voy. Zool., p. 152, t. xliv, fig. 9. 



— Banksii. Id. „ „ p. 38, t. xliv, fig. 9, 1842. 



— — Moller. Ind. Moll. Groenl., p. 20, 1842. 



— compressa. Forb. and Hanley. Hist. Brit. Moll., vol. i, p. 464, pi. 30, figs. 1 — 3, 



1848. 



— — Middendorff. Me'm. de I'Acad. St. Petersb., p. 560, 1849. 



— MULTICOSTATA. MacffUl. Moll. Abcrd., p. 260, 1843. 



— — Phil. Neuer Conchyl., vol. ii, p. 59, pi. i, fig. 8. 



— PULCHELLA (Jonas) Phil. Id. (fide Middendorf.) 



Spec. Char. Testa rotundato-trigond, subaquilaterali, nonnihil obliqud, deformi, 

 postice latiore, sulcata, vel dense striata, margine dorsali conveximculo, margine venfrali 

 integerrimo. 



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