182 MOLLUSCA FROM THE CRAG, 



Shell transverse, elliptical, somewhat compressed, semisulcated, inequilateral . 

 posterior side the longer, and truncated ; lunule deep, of an elongated heartshape ; 

 margin without crenulations. 



Localities. Mam. Crag, Bridlington, Bramerton ? 



Glacial Beds of Scotland, Ireland, Wales, and North of England, {Forbes.) 

 Uddevalla. Recent, Coast of Scotland, Finmark, and Greenland. 



I have seen only one specimen of this species belonging to the Mammaliferous 

 Crag, and that is from the Cabinet of Mr. Bean, who has obligingly permitted me to 

 have it figured, and this appears the oldest Deposit in which it is found ; there is no 

 specimen in my Cabinet from the Red Crag that can be fairly referred to this species ; 

 it is stated by Messrs. Forbes and Hanley to be particularly abundant in the more recent 

 beds of the glacial or antihuman period. This shell is said never to have its margins 

 crenulated, in which it differs essentially from the elliptical variety of A. Omalii. 



In the living state it appears confined to the northern portion of our seas, extending 

 into the colder regions of Finmark and Greenland, and is said to have a vertical range 

 of from 10 to 40 fathoms, usually on a muddy bottom. 



9. AsTARTE SULCATA, Dacostu. Tab. XVI, fig. 5 a — b. 



Pectunculus sulcatus. Dacosta. Brit. Conch., p. 192, 1778. 



Venus borealis (part). Chemn. Conch. Cab., t. vii, p. 2G, t. xxxix, fig. 413, 1784. 



— ScoTicA. Mat. and Rack. Linn. Trans., vol. viii, p. 81, t. ii, fig. 3, 1807. 



— — Mont. Test. Brit. Suppl., p. 44, 1808. 



— Danmonia. Id. „ „ p. 4,5, t. xxix, fig. 4, 1808. 



— sulcata. Id. Test. Brit., p. 131, 1803. 



Crasstna Danmoniensis. Brown, Illust. Brit. Conch., pi. xviii, fig. 1, 1827. 



— Scotica. Turt. Brit. Biv., p. 130, pi. xi, figs. 3, 4, 1822. 



— SULCATA. Id. „ p. 131, pi. xi, figs. 1, 2, 1822. 

 Crassine crassatell:ee. Chenu. Traite Elem., figs. 232, 233. 

 AsTARTE Scotica. Flem. Brit. Animals, p. 440, 1828. 



— — Loven. Ind. Moll. Scand., p. 36, 1846. 



— — Alder. Catal. Moll. North, and Durh., p. 87, 1847. 



— Danmoniensis. G. Sowerby. Gen. of Shells, figs. 1 — 3. 



— — Loven. Ind. Moll. Scand., p. 36, 1846. 



— — Middendorff. Mem. de I'Acad. Imp. de St. Petersb., p. .")60, 



t. xvii, fig. 3, 1849. 



— Scotica. Id., p. .560, t. xvii, figs. 1 and 2, and t. xvi, figs. 10— 12. 



— pallida. Jeffreys. Conch. Mag., p. 44, 1839. 

 SULCATA. Flem. Brit. Anim., p. 439. 



— — Forb. and Hani. Hist. Brit. Moll., vol. i, p. 452, pi. xxx, figs. 5, 6, 



pi. M, fig. 5. 



— Danmonia. Alder. Catal. Moll. North, and Durh., p. 86, 1847. 



— ovALis. Woodw. Geol. of Norf., p. 43, t. ii, fig. 15, 1833. 



— ANTiQUATA? (Lcathes' MSS.) Id., p. 43, t. ii, fig. 16, 1833, 



— VULGARIS. Jeffreys. Conch. Magaz., p. 44, 1839. 



