14. Mactra arcuata, Sowerby.
Loc., fossil. In the mammaliferous crag.
Note. Not known living. Appeared in the British Seas during the Coralline Crag epoch, and lived through that of the Red Crag.
15. Lutraria elliptica, Lamarck.
Syn., Mactra lutraria, Linnæus. Lutraria vulgaris, Fleming.
Loc., fossil. In the Irish and Lancashire beds.
Loc., living. In the Celtic and Southern regions of the European Sea.
Note. It is found fossil anterior to the Glacial epoch in both coralline and red crag, and in the Campinian beds of Belgium.
16. Scrobicularia piperata (Mactra sp.), Gmelin.
Mactra Listeri and piperata, Gmelin.
Syn., Mactra compressa, Montagu. Lutraria compressa and piperata, Lamarck. Tellina plana, Donovan. Lutraria Listeri, S. Wood. Amphidesma compressum, Fleming.
Loc., fossil. In the mammaliferous crag at Bramerton.
Loc., living. Throughout the European Seas.
Note. Appeared in our area during the Red Crag epoch.
17. Thracia declivis (Mya sp.), Pennant.
Syn., Anatina convexa, Turton. Amphidesma convexum, Fleming.
Loc., fossil. In clay beds at Belfast in situ.
Loc., living. The British Seas.
18. Abra alba (Mactra sp.), Wood.
Syn., Ligula Boysii, Montagu. Amphidesma album, Fleming. Erycina Renieri, Bronn.
Loc., fossil. Clyde beds, Dalmuir. Mammaliferous crag at Bulcham.
Loc., living. Throughout the European Seas, inhabiting the second and third zones of depth.
Note. Commences its range in the coralline crag.
19. Abra prismatica. (Ligula sp,), Montagu.
Loc., fossil. Greenock (Mr. Smith).
Loc., living. Throughout the European Seas, but chiefly in the north.
Note. Mr. Searles Wood records it as a fossil of the coralline crag.
20. Abra intermedia, W. Thompson.
Syn., Amphidesma obovale, S, Wood.
Loc., fossil. Mammaliferous crag of Southwold.
Loc., living. North and west of Ireland, and coast of Scotland. Denmark.
Note. Appears first in the red crag.
21. Montacuta bidentata (Mya, sp.), Montagu.
Loc., fossil. A Bridlington fossil, in Mr. Bowerbank's collection, appears to belong to this species.
Loc., living. European Seas (and coasts of Boreal America ?).
22. Corbula nucleus, Lamarck.
Syn., Corbula striata, Fleming. Mya inæquivalvis, Montagu. Corbula rotundata, Sowerby (Min. Conch.).
