Bembridge Beds, Isle of Wight.)
b. Lower marls, characterised by Cerithium mutabile, Cyrena pulchra, etc., and
by the remains of Trionyx (see Figure 166).
c. Green marls, often abounding in a peculiar species of oyster, and accompanied
by Cerithium, Mytilus, Arca, nucula, etc.)
(FIGURE 167. Bulimus ellipticus, Sowerby. Bembridge Limestone. 1/2 natural
size.)
(FIGURE 168. Helix occlusa, Edwards. Bembridge Limestone, Isle of Wight.)
(FIGURE 169. Paludina orbicularis. Bembridge.)
(FIGURE 170. Planorbis discus, Edwards. Bembridge. 1/2 diameter.)
(FIGURE 171. Lymnea longiscata, Brand. Natural size.)
(FIGURE 172. Chara tuberculata, seed-vessel. Bembridge Limestone, Isle of
Wight.)
d. Bembridge limestones, compact cream-coloured limestones alternating with
shales and marls, in all of which land-shells are common, especially at Sconce,
near Yarmouth, as described by Mr. F. Edwards. The Bulimus ellipticus, Figure
167, and Helix occlusa, Figure 168, are among its best known land-shells.
Paludina orbicularis, Figure 169, is also of frequent occurrence. One of the
bands is filled with a little globular Paludina.
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