Yet,
notwithstanding that the teeth were more numerous than any other bones, it is
remarkable that it was not until the relics of all these individuals had been
found, that a solitary example of part of a jaw-bone was obtained. Soon
afterwards remains both of the upper and lower jaw were met with in the Hastings
beds in Tilgate Forest, near Cuckfield. In the same sands at Hastings, Mr.
Beckles found large tridactyle impressions which it is conjectured were made by
the hind feet of this animal, on which it is ascertained that there were only
three well-developed toes.
(FIGURE 291. Cypris spinigera, Fitton.)
(FIGURE 292. Weald clay with Cyprides.)
Occasionally bands of limestone, called Sussex Marble, occur in the Weald Clay,
almost entirely composed of a species of Paludina, closely resembling the common
P. vivipara of English rivers. Shells of the Cypris, a genus of Crustaceans
mentioned in Chapter 3 as abounding in lakes and ponds, are also plentifully
scattered through the clays of the Wealden, sometimes producing, like plates of
mica, a thin lamination (see Figure 292).
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