58 Oeological Society. 



PE,OCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



November 23, 1887.— Prof. J. ^N. Judd, E.R.S., 

 President, in the Chair. 



The following communications were read : — 



1. " Note on a New Wealden Iguanodont, and other Dinosaurs." 

 13y P. Lydekker, Esq., B.A., E.G.S. 



The new species of I;/uanodon was founded upon a left ilium and 

 ischium, parts of the pubis and tibia, two metatarsals, several dorsal, 

 lumbar, and caudal vertebrae and other bones, obtained by Mr. C. 

 Dawson, E.G.S., from the Wadhurst clay of the Hastings Sand. 

 The species now described, which was named after the discoverer,, 

 and Iguanodon PrestwicJii, were shown to form a peculiar and 

 aberrant group of the genus lyuanodon. A maxilla from the 

 Wealden of the Isle of Wight was also described and referred to 

 Ornithoj^sis, 



The recent examination by the author of the remains of Dino- 

 sauria in the British Museum for the purpose of preparing a 

 Catalogue, had enabled him to make several notes on the various 

 forms represented in the collection, and these notes were embodied 

 in the present paper. The principal subjects mentioned were the- 

 following : — The identification of Iguanodon Sceleiji with /. bernis- 

 sartensis; the genera Bplienospondyhis and Cumnoria of Prof. 

 Seeley ; a British species of Trachodon from the Cambridge Green- 

 sand ; an ilium, provisionally referred to Uylaosaunis, from Cuck- 

 field ; the genera Vcctisaums and Mcgtioscmrvs ; the relations of the 

 Sauropoda and Thcropoda ; the type specimen of Omithopsis 

 BulJcei ; the similarity of the humerus in Pelorosaurns and Bronto- 

 saurus ; the vertebrae and other remains of Cetioscmrns ht-evis : the 

 humerus of C. liiimerocristatus and its relations to IscJiyrosaunis, 

 Hulke, Gigantosaurus, Seeley, and Omithopsis Leedsii, Hulke ; the 

 affinities between Cetiosaurus oxoniensis and Morosauriis ; the 

 occurrence of Titanosaurus in the "Wealden of England and the 

 possible identification of that genus with Binosaums of Owen ; 

 the vertebrae described by Owen as Bothriospondylus magniis ; the- 

 types of the genera Thecospondi/lus and BotliriospondyJus ; and 

 some Megalosaurian teeth. 



2. " On the Cae-Gwyn Cave." By T. M'Xenny Hughes, M.A., 

 F.G.S., Woodwardian Professor of Geology, Cambridge. 



The subject fell into two divisions : the Age of the Drift out- 

 side the Cave, and the relation of the deposits in the cave to that 

 Drift. The Author contended that the drift outside the cave was a 



