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. Lvdekker, 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 Machimosaurus. 
After reviewing the whole of the evidence, the Author concluded 
that he was dealing with a Crocodilian allied to Metriorhynchus , but 
forming the type of a new genus, to which he gave the name of 
Suchodus , adding the specific name of durobrivensis. 
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 Macromemum , and it is proposed to 
describe it as AT. 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 C 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 Cyphcispis , though it differs from the typical 
species 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. 
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