54 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 20 



May 20, 1857. 



Lieut. H. Thurburn, of the 42nd Regiment M.I., and James 

 Salter, M.B., F.L.S., 6 Montagu Street, were elected Fellows. Dr. 

 H. B. Geinitz, Professor of Geology and Mineralogy in the Univer- 

 sity at Dresden, was elected a Foreign Member. 



The following communications were read : — 



1. Description of a small Lophiodont Mammal (Pliolophus vul- 

 piceps, Owen), from the London Clay, near Harwich. By 

 Prof. Owen, F.R.S., F.G.S., &c. 



[Plates II., III., IV.] 



4 Contents. 



Introduction. 



Description of the skull. 



Comparison of the skull with that of other Mammalia. 



Description of the teeth. 



Affinities of the P. vulpiceps, as shown by the skull and teeth. 



Bones of the extremities : — Humerus ; Femur ; Tibia ; Metatarsal bone. 



Remarks on the limb-bones. 



Introduction. — The remains of Mammalia from Eocene beds below 

 the Binstead, Gypseous, and Headon or Hordwell series have hitherto 

 been very scanty, and for the most part fragmentary ; whether from 

 the clays of Loudon and Bracklesham, or from the equivalent sands, 

 conglomerates, or "calcaires grossiers" of the Continent. The best 

 evidence of Pachynolophus — a Lophiodont genus represented by 

 species of small size, characteristic of the conglomerate of Mont 

 Bernon (Pachynolophus Vismcei, Pomel) and of the " calcaire gros- 

 sier " of Nanterre, Passy, - and Vaugirard (Pachynolophus Duvalii, 

 Pomel), — consists of portions of upper and lower jaws, with teeth. 

 The Dichobune suillum, Gervais, from the "calcaire grossier " of 

 Passy, if it be a true Dichobune, rests upon a fragment of mandible 

 with three teeth, and on a few detached teeth, with an astragalus. 

 The genus Propalceotherium, Gervais (Palceotherium isselanum and 

 Pal. aurelianum, Cuv.), is represented by similar fragmentary evi- 

 dences of jaws and teeth from the lacustrine calcareous deposits at 

 Buchsweiler, on the Lower Rhine, at Issel in the department of Aude, 

 and at Argenton. The fossil eocene Monkey (Macacus [Eopithecus] 

 eoccenus) is known only by a small fragment of the under jaw with 

 two teeth, and by a detached mandibular molar from the lower 

 eocene sand of Suffolk. The best and most instructive mammalian 

 fossil hitherto obtained from the London clay has been the portion 

 of cranium with the molar series of teeth on which the genus Hyra- 

 cotherium* was founded. But the subject of the present commu- 

 nication is an entire skull with the complete dentition of both upper 

 and lower jaws (Plates II. and III.) and a portion of the skeleton of 



* Trans. Geol. Soc. 2nd series, vol. vi. p. 203, pi. 24. 



