Page:Quarterly Journal of the Geological Society of London, vol. 26.djvu/193

 Name of the Shell.

Mangelia linearis?, Mont.

Cancellaria viridula, O. Fab.

Trichoptropis borealis, Brod. & Sow.

Natica clausa, Brod. & Sow.

- Montagui, Forbes.

- groenlandica, Beck.

- occlusa, S. Wood.

- helicoides, Johnston

- catena, Dacosta.

Scalaria groenlandica, Chemn.

- Trevelyana? Leach.

Turritella polaris, Beck.

- incrassata, J. Sow.

- terebra, Linn.

Chemnitzia internodula, S. Wood.

Odostomia unidentata, Mont.

Rissoa obsoleta, S. Wood.

- semicostata? Woodward.

Littorina littorea, Linn.

- rudis, Maton & R.

The Middle-Glacial shell departs from the Crag linearis in being less slender, and in having more numerous costae.

Admete viridula of Woodward's list. C. costellifera, J. Sow., of 'Crag Mollusca.'

This species occurs in the Corralline Crag only; but the Coralline-Crag form is a very distinct variety from the Bridlington shell.

Iceland and Norway also. Naples, sec. Jeffreys.

Recently identified by Mr. Jeffreys with a Spitzbergen shell.

The Middle-Glacial specimen is too broken for certain identification.

T. erosa of 'Crag Mollusca' and of Woodward's list. T. clathratula of 'Crag Mollusca.'

Very abundant in Middle Glacial.

T. communis of 'Crag Mollusca' and of Woodward's Bridlington list; one fragment only from Middle Glacial. Mr. Leckenby knows no other form of Turritella from Bridlington that T. erosa. Given therefore on the authority of Woodward's list. Very rare in Crag.

Several broken specimens from the Middle Glacial. Said by Mr. Jeffreys to have recently been dredged living.

Unique in Crag. One specimen, with mouth perfect, from Middle Glacial.

Coralline Crag only.

Two specimens from the Middle Glacial, but too imperfect to show whether they be the extinct R. semicostata, with the denticulated lip, of the Crag, or the living R. inconspicua, a B, S form.