Page:Memoirs of the Geological Survey of Great Britain, Volume 1.djvu/436

Rh, fossil. Clyde beds. [Canada.]

, living. Arctic Seas, and coasts of Boreal America.

103. Rissoa semicostata (Turbo sp.), Montagu.

, fossil. Mammaliferous crag of Bramerton.

, living. Celtic Seas.

Note. The species is found in the red crag.

104. Rissoa sub-umbilicata (Turbo sp.), Montagu.

, Turbo minutus, Woodward.

, fossil. In the mammaliferous crag of Bramerton.

, living. Celtic Seas.

105. Scalaria groenlandica (Turbo sp.), Chemnitz.

Var. ''β. similis'', Sowerby (M. C). Scalaria subulata, Couthouy.

, fossil. Mammaliferous crag of Thorpe; Bridlington, Ireland? [Sweden, Canada].

, living. Seas of Greenland and Boreal America.

106. [Scalaria borealis.

, fossil. Canada, Sweden.

, living. Arctic Seas.]

107. Turritella terebra (Turbo sp.), Linnæus.

, Turritella communis, Risso. Turritella Linnæi, Deshayes.

, fossil. General in the pleistocene beds of Britain. Mammaliferous crag of Bramerton, Bridlington.

, living. Generally distributed through the European Seas.

Note. Occurs in both coralline and red crags.

108. Turritella incrassata, Sowerby (M. C).

, Turriiella triplicata, Brocchi.

, fossil. In the glacial beds of Wexford, not rare.

, living. In the Lusitanian and MediteraneanMediterranean [sic] Seas.

Note. This species appeared in our area during the Coralline Crag epoch. It occurs in the red crag. In the drift it is only found towards its southernmost limits. At the close of the Glacial epoch, it retired to more southern seas, and is now abundant on the coast of the south of Spain. Both fossil and recent specimens vary extremely, the whorls presenting every degree of convexity, and in some examples being quite flat. The number and form of the spiral ridges vary, but in every case the interstices are finely striated.

109. Cerithium punctatum, Woodward.

, fossil, Bramerton.

Note. Not known living. A red crag species.

110. Aporrhais pes-pelecani (Strombus sp.), Linnæus.

, fossil, Dalmuir. Ireland.

, living. Throughout the Northern Celtic, Lusitanian, and Mediterranean provinces of the European Seas.

Note. Appears in British area during the Coralline Crag epoch. Is found in the red crag.

111. Murex erinaceus. Linnæus.

fossil. Scottish and Irish beds. Mammaliferous crag, near Norwich.