2. Of living British species usually regarded as Northern, but not observed hitherto in glacial beds.
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Velutina elongata.
Natica helicoides.
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Rissoa semistriata.
Rissoa subumbilicata.
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3. Of living British species not found fossil in typical glacial beds, but occurring in contemporaneous Italian newer pliocene strata.
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Mactra stultorum.
Mactra subtruncata. Lucina radula.
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Tellina crassa.
Tellina fabula. Bulla obtusa?
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4. Of species not now known in the British Seas, but still living in the Mediterranean. Not fossil in drift beds elsewhere.
Cardita corbis.
5. Of glacial species of Arctic origin; with the exception of the first, not now living in, or doubtful inhabitants of, the British Seas.
Terebratula caput serpentis,
Scalaria groenlandica var. similis,
Tellina calcarea (vars. obliqua, prætenuis and ovata).
Nucula oblongoides (hyperbarea).
6. Of extinct crag forms, those marked with an asterisk, are new species of Mr. Wood.
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Mya lata.
Mactra arcuata. *Abra obovale. *Loripes undularia. *Lucina gyrata.
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*Astarte pisiformis.
Nucula Cobboldiæ. Lottia parvula. Cerithium punctatum.
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From the beds at Bridlington, Mr. Lyell[1] enumerates 35 species of testacea, of which 20 were living forms, and 26 species common to the mammaliferous or Norwich crag. I have had an opportunity of examining a collection from this locality belonging to my friend Mr. Bowerbank, who, with his accustomed liberality, has permitted me to make use of it. It includes 28 species. Of these, Dentalium entalis, Aporrhais pespelicani, Littorina littorea, Turritella terebra, Buccinum undatum, Anomia ephippium?, Saxicava rugosa, Astarte compressa, Tellina solidula, Pleurotoma turricula, and Balanus balanoides, are common living British species known also as fossils in most glacial beds.
Trichotropis borealis, Natica groenlandica, Fusus Sabini and Astarte borealis, are rare North British species of Arctic origin.
Fusus fornicatus and scalariformis, Tellina groenlandica, are Arctic and Boreal American species, the first extremely rare, the others not now living in the British Seas.
- ↑ Magazine of Natural History, vol. xii. p. 324.
