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It had evidently lived in the sea of the Red Crag, where it had been exposed to rough usage, and sustained injuries like those which the reversed whelk, Trophon antiquum, so characteristic of the same formation, often exhibits. Additional proofs, however, have lately been obtained by Mr.
The incumbent till or boulder clay is about 40 feet thick, but it often attains much greater thickness in the same part of Scotland. Pecten islandicus, Moll. Natica clausa, Bred. Trophon clathratum, Linne. Leda truncata. a. Exterior of left valve. b. Tellina calcarea, Chem. Outside of left valve. b.
On the other hand, at Walton-on-the-Naze, in Essex, we seem to have an exhibition of the oldest phase of the Red Crag; and a warmer climate seems indicated, not only by the absence of many northern forms, but also by the abundance of some now living in the British seas and the Mediterranean. Trophon antiquum, Muller.
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