abundance of specimens of Oliva Branderi, forming the equivalent to number eighteen in Dr. Wright's arrangement, and which, when worked, emits a strong smell of sulphur.
Immediately under the Olive Bed, as seen in the opposite section (II.), taken immediately on the west side of the Bunny, rises grey sand, seventeen feet and half in thickness, possessing only a few casts of shells. The next bed, however, composed also of grey sand, rising about three hundred yards farther on, is, perhaps, the richest in the whole of this Marine series, and its shells the best preserved. It may at once be recognised by the profusion of Chama squamosa, from which it has been called the Chama Bed. Specimens of Arca Branderi and Solen gracilis may be found here as perfect as on the day they were deposited.
A little farther on, nearly under the Gangway, rises the Barton clay, encrusted with Crassatella sulcata.[1] And here,
- ↑ Some of the most characteristic shells in this bed may perhaps be mentioned:—
Pleurotoma exorta. Sol. Scalaria reticulata. Sow. Terebellum fusiforme. Lam. Scalaria semicostata. Sow. Murex minax. Sol. Littorina sulcata. Pilk. Murex asper. Sol. Solarium plicatum. Lam. Murex bispinosus. Sow. Hipponyx squamiformis. Lam. Typhis pungeus. Sol. Fusus porrectus. Sol. Voluta ambigua. Sol. Fusus errans. Sol. Voluta costata. Sol. Fusus longævus. Sol. Voluta luctatrix. Sol. Bulla constricta. Sow. Dentalium striatum Sow. Bulla elliptica. Desh. I scarcely need, I hope, refer the reader either to Mr. Edwards' Monograph on the Eocene Mollusca, 1849, 1852, 1854, 1856, or to Mr. Searles Wood's Monograph on the same subject, both in course of publication by the Palæontographical Society. There is an excellent table of the Barton shells, by Mr. Prestwich, in the Geological Journal, vol. xiii. pp. 118-126.
