Imatges de pàgina
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treble rows peculiar to the shark; but the animal must have been of a small species, or more probably a young one. The tooth g is figured from Agassiz, (Carcharias Megalotis,) and figure h, from a drawing by Dr Mantel, of the squalus mustelus, in the Wealden beds of Sussex. At Woodhall, on the north side of the Pentland Hills, the coal strata are exposed on the banks of the Water of Leith. In a stratum of shale, lying below ten feet of sandstone, an immense number of the bivalve shell, plate 2, figs. a and b, are visible. The only figures of shells in the least resembling these, which I have seen, are in Cuvier and Brongniart's Illustrations of the Paris Basin, (Ossmen. Fossil. tom. ii.) supposed Cytherea convexa; and in vol. iv. pl. 314. of Sowerby's Fossil Conchology, under the name of Axinus obscurus, said to be found in magnesian limestone. Both species differ from the figure here given, which may be named, from its locality, Axinus Pentlandicus.

Figurès c, d, e, f, are unios from the coal shale at Polmont, near Falkirk; c appears almost identical with Sowerby and Mantel's Unio antiquus of the Wealden. Figure d is the same shell shewing the hinge.

Fig. f. resembles the Unio compressus of the same locality.

Figures h h are minute shells, found in great numbers in the Burdiehouse limestone, supposed to be of the genus Cypris. Species of these are abundant in the Sussex beds.

Figure 9 is evidently a modiola, found in the same beds with Axinus Pentlandicus, at Woodhall, and differs little from the existing species.

Sphenopteres and equisite are also abundant in this shale. The Sphenopteris affinis found in Burdiehouse seems analogous to the S. Sillimanni of the Wealden beds, figured in Dr Mantel's work.

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