Page:Memoirs of the Geological Survey of Great Britain, Volume 1.djvu/438

Rh, fossil. Drift beds of Wexford.

, living. Seas of Greenland.

117. Fusus, nov. sp.? or variety of F. crispus, Brocchi.

A shell measuring above an inch in length, fusiform, the whorls narrow, and crossed by prominent ribs which are traversed by raised spiral ridges. The characters are those of Fusus crispus, of which it is probably an extreme form; but more perfect specimens are required for accurate determination. It is very distinct from any recorded drift fossil.

, fossil. Wexford.

, living. Fusus crispus is at present a Mediterranean species. It occurs fossil in the sub-Appennine beds.

118. Fusus Forbesi, Strickland. [According to Mr. G. Sowerby, identical with Fusus cinereus of Say, an American species synonymous with the Buccinum plicosum of Menke.]

, fossil. Isle of Man.

, living. Coasts of United States.

119. Fusus Sabini. Gray.

, (var.) Fusus ventricosus, Gray?

, fossil. Irish drift. Bridlington.

, living. Banks of Newfoundland. Arctic Seas. Zetland. Closely resembles the following species.

120. Fusus Islandicus, Martini.

, Fusus comeus of British authors, but not of Linnaeus. Fusus angustus, S. Wood.

, fossil. Irish drift.

, living. Common in the Celtic, Northern, and Arctic Seas. Greenland. Coasts of Boreal America.

121. Fusus despectus, (Murex sp.), Linnæus.

, Fusus carinatus, Lamarck.

Fusus striatus, var. carinatus, Sowerby (M.C.).

Fusus tornatus Gould. Tritonium fornicatum, Fabricius.

, fossil. In the mammaliferous crag of Bramerton. Dalmuir. Bridlington: a specimen from the last locality in Mr. Bowerbank's collection is reversed, and frequently ribbed like the Fusus decemcostatus of Say. [Russia, Canada.]

, living. Very rare in the British Seas. Arctic Seas. Greenland. Seas of Boreal America.

122. Fusus antiquus. (Tritonium sp.), Muller.

Syn., Murex despectus, Montagu.

(Reversed variety.) Fusus contrarius. (Murex sp.), Sowerby (in M.C.).

, fossil. Both forms are found in the Irish drift, but chiefly (in the south) the reversed variety. The normal form occurs in the Scotch beds. Mammaliferous crag of Bramerton.

[In the Sicilian newer pliocene beds, the reversed variety is found, though both forms are now extinct in the Mediterranean regions.]

, living. Celtic, Northern, (and Arctic?) Seas of Europe; rarely reversed.