[267]In the coast-map at p. 148, the principal beds are marked, so that, I trust, there will be no difficulty in finding them. [268]For the direction of the river from east to west, see a paper “On the Discovery of an Alligator and several New Mammalia in Hordwell Cliff,” by Searles Wood, F.G.S.: _London Geological Journal_, No. 1., pp. 6, 7. [269]“The Freshwater Strata of Hordwell Cliff, Beacon Cliff, and Barton Cliff:” _Transactions of the Geological Society_, second series, vol. ii., p. 287. [270]“Stratigraphical Account of the Section of Hordwell, Beckton, and Barton Cliffs:” _The Annals and Magazine of Natural History_, June, 1851. In making these measurements I was very greatly assisted by the Rev. W. Fox, who was most untiring to ensure accuracy. [271]See the _Geological Journal_, vol. iv., p. 17; as also, Professor Owen’s _Monograph_ on “The Fossil Reptilia of the London Clay,” published by the Palæontographical Society, 1850, p. 48. [272]Some of the most characteristic shells in this bed may perhaps be mentioned:— Pleurotoma exorta. _Sol._ Terebellum fusiforme. _Lam._ Murex minax. _Sol._ Murex asper. _Sol._ Murex bispinosus. _Sow._ Typhis pungens. _Sol._ Voluta ambigua. _Sol._ Voluta costata. _Sol._ Voluta luctatrix. _Sol._ Dentalium striatum. _Sow._ Scalaria reticulata. _Sow._ Scalaria semicostata. _Sow._ Littorina sulcata. _Pilk._ Solarium plicatum. _Lam._ Hipponyx squamiformis. _Lam._ Fusus porrectus. _Sol._ Fusus errans. _Sol._ Fusus longævus. _Lam._ Bulla constricta. _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. [273]For the High Cliff Beds, see Mr. Fisher’s paper on the Bracklesham Sands of the Isle of Wight Basin, in the _Proceedings of the Geological Society_, May, 1862, pp. 86-91, whose divisions are here followed. [274]All these beds are shown in the large map by the word “Fossils,” there not being space enough to particularize each bed.