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Some of these testacea, such as Cardita squamosa, are inhabitants of deep water, and the deposit on the whole seems to indicate a depth of water exceeding a hundred feet. In the island of St. Mary's, one of the Azores, marine fossil shells have long been known. The pebbles in the conglomerate are cemented together with carbonate of lime. Mr.
The Hippopus found here differs from the maculatus already known by the much greater elevation of its shell. The large Tridachna is the Tr. squamosa Lam.
But if we were to attach importance to such occasional passages, we should soon find that no lines of division could be drawn anywhere, for in the present state of our knowledge of the Tertiary series there will always be species common to beds above and below our boundary-lines. Chama squamosa, Eichw.
Both in the Isle of Wight, and in Hordwell Cliff, Hants, the Headon beds, above- mentioned, rest on white sands usually devoid of fossils, and used in the Isle of Wight for making glass. In one of these sands Dr. Wright found Chama squamosa, a Barton Clay shell, in great plenty, and certain impressions of marine shells have been found in sands supposed to be of the same age in Whitecliff Bay.
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