Geological Society of London. 4] 
and TIyuanodon Prestwichi, were shown to form a peculiar and 
aberrant group of the genus Iguanodon. A maxilla from the 
Wealden of the Isle of Wight was also described and referred to 
Ornithopsis. 
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 Seeleyi with I. bernis- 
sartensis; the genera Sphenospondylus and Cumnoria of Prof. Seeley ; 
a British species of Trachodon from the Cambridge Greensand ; an 
ilium, provisionally referred to Hylgosaurus, from Cuckfield ; the 
genera Vectisaurus and Regnosaurus; the relations of the Sauro- 
poda and Theropoda; the type specimen of Ornithopsis Hulket ; 
the similarity of the humerus in Pelorosaurus and Brontosaurus ; the 
vertebrae and other remains of Cetiosaurus brevis; the humerus of 
C. humerocristatus and its relations to Ischyrosaurus, Hulke, Giganto- 
saurus, Seeley, and Ornithopsis Leedsii, Hulke; the affinities between 
Cetiosaurus oxoniensis and Morosaurus; the occurrence of Titano- 
saurus in the Wealden of England and the possible identification of 
that genus with the Dinodocus of Owen; the vertebrae described by 
Owen as Bothriospondylus magnus; the types of the genera Theco- 
spondylus and Bothriospondylus ; and some Megalosaurian teeth. 
2. “On the Cae-Gwyn Cave.” By T. McKenny Hughes, M.A., 
F.G.S., Woodwardian Professor of Geology, Cambridge. 
The subject fell into two divisions: The Age of the Drift outside 
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 marine 
deposit remanié from older beds of glacial age, but was itself post- 
glacial and of approximately the same date as the St. Asaph drift ; 
in confirmation of which he gave the following list of shells from 
that drift outside the cave:—Ostrea edulis, Pecten varius, Mytilus 
edulis, Cardium echinatum, C. edule, Cyprina islandica, Astarte 
borealis, A. suleata, A. var., Venus gallina, Tellina balthica, Psam- 
mobia ferroensis, Mya truncata, Fissurella greca, Littorina littorea, 
Turritella terebra, and Buccinum undatum; pointing out that there 
was only the one species of Astarte among them which was not 
common on the adjoining coast, just as there were in the older post- 
glacial river-gravels of the 8.H. of England two locally extinct 
forms, the Corbicula fluminalis and the Unio littoralis, and discussing 
various difficulties, stratigraphical and paleontological, in the way 
of accepting the view that the cave-deposits were glacial, inter- 
glacial, or preglacial. For instance, he remarked that there were 
no marks of glaciation on the face of the rock in which the cave 
occurred; that the cave-deposits were like drift because derived 
from it, but that no continuity existed between the drift and the 
cave-deposits; that there was a much greater thickness of rain-wash 
and resorted marine-drift looped down over the upper opening into 
the cave than over the adjoining surface. The upper part of this 
