Page:Memoirs of the Geological Survey of Great Britain, Volume 1.djvu/425

412 latus (Min. Conch., t. 315). Mr. King, of Newcastle, has constituted a genus under the name of Schizodus for the former, but as the latter belongs to a known genus, and the former was the type of the Sowerbian genus Axinus, that name cannot be superseded by Schizodus.

34. Lucina radula (Tellina sp.), Montagu.

, Venus borealis, Pennant. Venus spuria, Dillwyn. Lucina antiquata, Sowerby (M. C).

, fossil. Ireland? In the mammaliferous crag at Thorpe [Sweden].

, living. In the Scandinavian and British Seas (frequent). Bare in the Mediterranean [Phillippi]. Coasts of Boreal America [Gould].

Note. Appears in the British Seas during the epoch of the Coralline Crag. Continued during the Bed Crag epoch. In the Campinian beds of Belgium [Nyst]. Common in the Mediterranean region during the Newer Pliocene epoch.

35. Lucina undularia (Loripes sp,), Searles Wood (MSS.).

, fossil. Mammaliferous crag of Bramerton.

36. Lucina astartea, Nyst.

, Lucina gyrata, Searles Wood (MSS.).

, fossil. Mammaliferous crag of Bramerton.

Note. In the crag of Belgium.

37. Astarte borealis (Venus sp.), linnæus.

, Astarte plana, Sowerby (M. C). Crassina Withami, Smith and Brown.

, fossil. Frequent in the glacial beds of Scotland, Ireland, and the north of England. Bridlington. Mammaliferous crag of Bramerton. [Sweden, Russia.]

, living. In the Arctic Seas and on the coast of Boreal America. A single fresh valve was dredged by Mr. Mac Andrew and myself in 80 fathoms water, 40 miles to the west of the mainland of Zetland (August, 1845).

Note. Not known in British formations anterior to the Glacial epoch.

38. Astarte elliptica, Brown.

, This shell is usually known as Astarte gairensis, a MS. name given to it by Mr. Nicol, who first observed the species. It is also the Crassina ovata of Brown, which is the more common variety. The Crssina depressaof Brown appears to be a third form. [Astarte sulcata of Nilson.]

, fossil. Every where in the glacial beds of Scotland, Ireland, Wales, and the north of England. [Sweden, Russia.]

, living. Scottish and Northern Seas. Very abundant in the lochs of the Clyde district.

39. Astarte danmoniensis (Venus sp.), Montagu.

, Crassina danmoniensis, Lamarck. Crassina sulcata, Turton, not of Montagu?) Astarte scotica is the young of this species, or a variety in which the margin of the valves is not crenulated. Some conchologists, however, regard the Astarte elliptica as the true A. scotica of Montagu.

, fossil. In the Clyde district, the Isle of Man, Ireland, and the north of England, Bridlington. [Russia.]