Page:Memoirs of the Geological Survey of Great Britain, Volume 1.djvu/439

426 Note, The reversed variety is found in the Campinian beds of Belgium.

123. Pleurotoma turricula. (Murex sp.), Montaga.

, Murex angulatus, Donovan. Pleurotama Woodiana, Möller.

, fossil. A very variable species, common in the Scotch and Irish beds. Also in the north of England and Isle of Man. In the Bridlington beds, where there are several curious varieties, possibly identical with some of the supposed species into which Möller ('Index Molluscorum Groenlandiæ') has divided this Pleurotoma, In the mammaliferous crag of Bramerton.

, living, Celtic, Northern, and Arctic provinces of the European Seas. Greenland and Boreal America.

Note. It occurs in the red crag.

124. Pleurotoma discrepans, Brown.

, Pleurotoma decussata, Couthouy?

, fossil. Dalmuir.

, living, Scottish Seas, very rare. Seas of Boreal America (if decussata).

125. Pleurotoma septangularis (Murex sp.), Montagu.

, fossil. Ireland.

, living. British Seas.

126. Pleurotoma rufa (Murex sp.), Montagu.

, fossil. Ireland. Mammaliferous crag of Thorpe.

, living. British Seas. Seas of Boreal America.

127. Pleurotoma sp.

, fossil. A small, tapering, smooth species, from Wexford, closely resembling a form now living among the Channel Isles, but too imperfect for determination.

128. Pleurotoma sp.

A small species nearly allied to Pleurotoma linearis. The whorls are convex, spirally furrowed, and strongly ribbed longitudinally. The ribs on the body whorl are twelve. More perfect specimens are required. From Wexford.

129. Buccinum undatum, Linnæus; and var. ''β. tenerum'' (M. C).

, fossil. Common in the glacial beds of Britain and Ireland, varying from the strong and coarsely-ribbed normal form to thin and slightly-undulated varieties, which can scarcely be distinguished from the next species. Buccinum striatum of Smith appears to be one of these varieties. Bridlington.

[Sweden, Russia. During the same epoch it inhabited the Mediterranean, but no longer lives there now.]

, living. Celtic, Northern and Arctic regions of the European Seas. Coasts of Boreal America, from Cape Cod northwards.

Note. It appeared within our area during the Coralline Crag epoch.

130. Buccinum ciliatum. Fabricius.

[A variety] Buccinum Humphreysianum, Bennett Possibly Buccinum fusiforme of Broderip, may be an extreme form of this species.

, fossil. North of England and Scotland.