Geohnpcdl Society. 113 



PROCEEDIXGS OF LEARXED SOCIETIES. 

 GEOLOGICAL SOCIETY. 



March 12, 1890.— J. \\. Hulko, Est]., F.R.S., Vice- 

 President, in the Chair. 



The following communications were read : — 



1. "On a Crocodilian Jaw from the Oxford Clav 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 impeifect skull found by 

 Mr. Leeds in the same formation at Peterborough apjiears to 

 belong to the same form as the mandible, and show's that the 

 latter cannot be referred to Machimosaunts. 



After reviewing the whole of the evidence, the Author concluded 

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

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

 Suchodiis, adding the specific name of darobrivensis. 



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 Macromerwm, 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 Eri/ops under the name 

 E. Oiveni. 



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

 President, in the Chair. 



The following communications were read: — 



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

 rocks of Yorkshire." By Miss Coiguou, 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 Cypliaspis, though it differs from the typical 

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

 name Cypliaspis acantliine is proposed for this form. 



Ann.d; Mag. N. Hist. Ser. 6. Vol. vi. 8 



