Geological Society. 113 



PROCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



March 12, 1890.— J. W. Hulke, Esq., F.R.S., Vice- 

 President, in the Chair. 



The following communications were read : — 



1. "On a Crocodilian Jaw from the Oxford Clay of Peter- 

 borough." By R. Lydekker, Esq., B.A., F.G.S., &c. 



The symphysis of the mandible of a Thecodont Reptile obtained by 

 Mr. Leeds from the Oxford Clay near Peterborough was described by 

 the Author, and reasons were given for referring it to the Crocodilia 

 rather than to the Sauropterygia. An imperfect skull found by 

 Mr. Leeds in the same formation at Peterborough appears to 

 belong to the same form as the mandible, and shows that the 

 latter cannot be referred to Macliimosaurus. 



After reviewing the whole of the evidence, the Author concluded 

 that he was dealing with a Crocodilian allied to Metriorhijnchus, but 

 forming the type of a new genus, to which he gave the name of 

 Suchodus, adding the specific name of durohrivensis. 



2. " On two new Species of Labyrinthodonts." By R. Lydekker, 

 Esq., B.A., F.G.S., &c. 



The right ramus of the lower jaw of a Labyrinthodont, from the 

 Lower Carboniferous of Gilmerton, near Edinburgh, is regarded as 

 referable to the Permian genus Macromerium, and it is proposed to 

 describe it as M. scoticum. 



Another mandible, from the Karoo system of South Africa, is 

 referred to the American Permian genus Eryops under the name 

 E. Oweni. 



March 26, 1890.— J. W. Hulke, Esq., F.R.S., Vice- 

 President, in the Chair. 



The following communications were read : — 



1. " On a new Species of Cyphaspis from the Carboniferous 

 rocks of Yorkshire." By Miss Coignou, Cambridge. (Communicated 

 by Professor T. M^K. Hughes, M.A., F.R.S., F.G.S.) 



The Author describes a fairly perfect head of a Trilobite found in 

 the Pendleside limestone of Butterhaw, near Cracoe, which appears 

 to belong to the genus Oyphaspis, though it differs from the typical 

 Bpecies of that genus in possessing two pairs of glabellar lobes. The 

 name Cyphaspis acanthine is proposed for this form. 



Ann. & Mag. N. Hist. Ser. 6. Vol. vi. 8 



