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Corresponding to the smaller number of divisions the ridges are more Avidely separated, less elevated, and broader at their base, while the intersijaces are also wider and more open than in the North American ]\lastodon. The layer of enamel is of similar thickness, and there is no appreciable crust of cement. The correspondence is followed out in the form of the subordinate heel ridge. D. Tndicum, however, is the species most nearly allied to il/. Ohioticus.-B.M. FAUNA ANTIQUA SIVALENSIS. Plate IV. Elephas Hysudricus. (Falc. and Caut.), from the Sewalik hills. Front view of skull, one-fifth nat. size. This fine specimen was purchased from Conductor Dawe.-B.M. Length of the cranium from the protuberances of the occipital to the broken tip of left incisive, 45" in. Length from broken occipital condyles to anterior border of alveolus, 28" in. Vertical height of head, from broken condyles to the pyramidal ' Misnamed Elephas meridionalis in Plate. See notes pages 18 and 23.

The collection of fossil bones presented to the Geological Society by Captain Fulijames not having been accompanied by any memoir, and no description of it having yet been given in the publications of the Society, the Pre.. sldent and Council have not hesitated to deviate from their usual course with regard to the publication of memoirs, and have directed the insertion of Dr. Falconer's communication in the present number of the Journal of the Society. t This communication was read on Tuesday, 24th June.

Introduction. Generic distinctions and nomenclature of the Prohoscidea. Dinotherium. Mastodon and Elephas. The distinctive and specific characters of Mastodon and Elephas. The British fossil Mastodon, and its comparison with M. angustideas, M. ~4rver-nen~, and M. longiroslris. Mastodon angustidens. M. .4rvernensis and M. longirostris. British specimens of Mastodon. Molars. Premolars. Milk-molars. Lower jaw. Geological age of the Mastodons. Mastodon angustideus, M. longirostris, and M. [lrvernensis. Mastodon of the Crag, in particular. Conclusion.

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