Fig. 234.
Cypris tuberculata, Fitton.
Fig. 235.
Shells of the Cypris, an animal belonging to the Crustacea, and before mentioned ([p. 31.]) as abounding in lakes and ponds, are also plentifully scattered through the clays of the Wealden, sometimes producing, like the plates of mica, a thin lamination (see [fig. 235.]). Similar cypriferous marls are found in the lacustrine tertiary beds of Auvergne (see above, [p. 183.]).
Hastings Sands.
This middle division of the Wealden consists of sand, calciferous grit, clay, and shale; the argillaceous strata, notwithstanding the name, being nearly in the same proportion as the arenaceous. The calcareous sandstone and grit of Tilgate Forest, near Cuckfield, in which the remains of the Iguanodon and Hyleosaurus were first found, constitute an upper member of this formation. The white "sand-rock" of the Hastings cliffs, about 100 feet thick, is one of the lower members of the same. The reptiles, which are very abundant in it, consist partly of saurians, already referred by Owen and Mantell to eight genera, among which, besides those already enumerated, we find the Megalosaurus and Plesiosaurus. The Pterodactyl, also a flying reptile, is met with in the same strata, and many remains of Testudinata of the genera Trionyx and Emys, now confined to tropical regions.