﻿74 Geological Society : — ■ 



3. " On a new Labyrinthodont Amphibian from the Magnesian 

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

 F.L.S., and Eichard Howse, Esq. 



The specimen described by the authors was remarkable for the 

 great development of the ventral scutes, which 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 Dasy- 

 ceps and to Pholiderpeton scutigerum (Huxl.); but, from the pecu- 

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

 other peculiarities presented by the head, they regarded it as form- 

 ing the type of a new genus, which they proposed to name Lepido- 

 tosaurus. The species they named L. Duffii, in honour of its disco- 

 verer, Mr. Joseph Duff. 



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

 Proterosaurus Huocleyi, from the Marl-slate of Midderidge, Durham." 

 By Albany Hancock, Esq., F.L.S., and Richard Howse, Esq. 



In this paper the authors described a specimen which they referred 

 to Proterosaurus Speneri, von Meyer — and one of a smaller form, 

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

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

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

 long, and the neck long and composed of seven vertebrse, in the 

 number of dorsal vertebrae, 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. Huxley i 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 consi- 

 derably longer in proportion to the fore limb ; and the distal extre- 

 mity of the humerus is only twice as wide as the constricted part, 

 instead of three times, as in the old species. 



June 22, 1870. — Joseph Prestwich, Esq., F.B.S., President, 

 in the Chair. 



The following communications were read : — 



1. " Notes on the Lower portion of the Green-slates and Porphyries 

 of the Lake District between Ulleswater and Keswick." By H. 

 Alleyne Nicholson, M.D., D.Sc, M.A., E.B.S.E., E.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, 

 on the east side of Derwentwater, between Keswick and the Yale of 

 St. John, in the Vale of St. John, in Matterdale, in Eycott Hill, 

 between Ulleswater and Haweswater, and in the neighbourhood of 

 Shap. In the Borrowdale section the sequence of the rocks is given 

 by the author as follows. Besting on the Skiddaw slates there are :- — 

 (1) a felspathic trap ; (2) a great series of ashes, breccias, and amyg- 



