Geological Society of London. 389 



Discussion. — Sir Charles Lyell considered the Forest-bed to be older than the 

 Stony-bed. 



Mr. Gunn remarked that at Easton Bavent the Chillesford Clay is in the cliff, and 

 the Forest-bed in the beach beneath it. He referred to various instances of the 

 occurrence of mammalian remains on the coast. 



3. "On a new Labyrinthodont Amphibian, from the Magnesian 

 Limestone of Midderidge, Durham." By Albany Hancock, Esq., 

 F.L.S., and Eichard Howse, Esq. Communicated by Prof. Huxley, 

 F.E.S., F.G.S. 



The specimen described by the authors -was remarkable for the 

 great development of the ventral scutes, vfhich were of large size, 

 minutely striated, imbricated, and arranged in diagonal lines, sloping 

 from behind forward, giving the surface of the fossil a strongly 

 ribbed appearance. The authors stated that it was allied to Lasy- 

 ceps and to PhoUderpeton scutigerum (Huxl.) ; but from the peculiar 

 characters of its scutes, its elongated narrow muzzle, and some other 

 peculiarities presented by the head, they regarded it as forming the 

 type of a new genus, which they proposed to name Lepidotosaurus. 

 The species they named L. Buffii, in honour of its discoverer, Mr. 

 Joseph Duff. 



4. " On Proterosaurus Speneri (von Meyer), and a new species, 

 Proterosaurm Huxley i, from the Marl- slate of Midderidge, Durham." 

 By Albany Hancock, Esq., P.L.S., and Eichard Howse, Esq. Com- 

 municated by Prof. Huxley, F.E.S., P.G.S. 



In this paper the authors described a specimen which they referred 

 to Proterosaurus Speneri (von Meyer) ; and one of smaller form, 

 which they regarded as new, and described as Proterosaurus EJux- 

 leyi. Both were from the same part of the Marl-slate of Midde- 

 ridge, Durham. The two species agree in having the limbs, tail, 

 and neck long, and composed of seven vertebrge, in the number 

 of dorsal vertebree, in the number and character of the bones 

 of the hand, and in some other particulars, sufficient, with these, in 

 the opinion of the authors, to justify the reference of both to the 

 genus Proterosaurus. In P. Huxleyi the ribs are flattened instead 

 of rounded at the proximal extremity, and less widened and 

 grooved at the distal extremity than in P. Speneri ; the hind-limb is 

 considerably longer in proportion to the fore-limb ; and the distal 

 extremity of the humerus is only twice as wide as the constricted 

 part, instead of three times, as in the old species. 



11. June 22nd, 1870. — 1. " Notes on the Lower Portion of the 

 Greenslates and Porphyries of the Lake District between UUeswater 

 and Keswick." By H. AUeyne Nicholson, M.D., D.Sc, M.A., 

 F.E.S.E., F.G.S., Lecturer on Natural History in the Medical School 

 of Edinburgh. 



The author describes the characters presented by the lower part 

 of that series of rocks, named, by Professor Sedgwick, the " Green- 

 slates and Porphyries," which overlie the Skiddaw Slates in the 

 Lake District. He notices the sections of this series in Borrowdale, 



