Geological Society of London. 129 



in.— February 8, 1882.— E. Etheridge, Esq., F.E.S., President, 

 in the Chair. — The following comraunications were read : — 



1. " Description of some Iguanodon Eemains discovered at Brook, 

 Isle of Wight, indicating a New Species, Iguanodon Seelyi." By J. 

 W. Hulke, Esq., F.E.S. 



After referring to the Iguanodon remains preserved in the Brussels 

 Natural History Museum, the author described some fossils obtained by 

 him in 1870 from a bed between the red and purple clays and the flint 

 gravel capping the cliff in Brook Bay. The ilium, when complete, 

 was not less than 124 centim. long, with a maximum vertical extent of 

 33 centim. The dorsal border is stout and slightly overhangs the 

 outer surface. The pr^acetabular process is relatively short, and 

 the postacetabular part of the bone tapers more than in Mantell's 

 Iguanodon. The femur, when entire, could not have been less than 

 108 centim. long ; the girth of the condyles is 82 centim., and their 

 breadth 32 centim. ; the tibia is shorter than the femur. Both 

 metatarsi demonstrate the existence of but three functional toes ; 

 the middle metatarsal is the longest, attaining 35-5 centim., the 

 outer metatarsal 29 centim., and the inner 26 centim. ; the inner 

 toe has three phalanges, the middle four, and the outer toe five. 

 The toes of the Iguanodon therefore correspond to the second, third, 

 and fourth toes of Hypsilophodon. The ungual phalanx of the 

 inner toe is 17 centim. long, that of the middle toe nearly 18 centim. 

 long, and that of the outer toe about 15'5 centim. long. 



The humerus is about 10 centim. long. Its proximal end has a 

 well-developed posterior or inner process, and a large deltoid crest. 

 The caudal vertebrge, three probably between the 4th and the 10th 

 in this series, have very four-sided articular surfaces suggestively 

 like those hitherto referred to Pelorosaurus. The chevron bones are 

 very stout and long. The differences in their ilia show this and 

 Mantell's Iguanodon to be specifically distinct ; and with this new 

 Iguanodon the author connected the name of C. Seely, Esq., M.P., 

 of Brook House, in recognition of his courteous permission to 

 excavate the cliff for the recovery of the fossils, naming it Iguanodon 

 Seelyi. 



1. " On a peculiar Bed of Angular Drift on the high Lower-Chalk 

 Plain between Didcot and Chilton." By Prof. J. Prestwich, M.A., 

 F.E.S., F.G.S. 



In making a railway from the main line to Chilton, this bed of 

 drift was cut through for a depth of about 1\ mile. It lies on a flat 

 plain extending from the foot of the escarpment of Upper Chalk 

 to the top of that of Lower Chalk. In places it is full 28 feet thick. 

 At first a fine chalk rubble, it becomes after a while coarse, and is 

 divided by clay-beds into an upper and a lower deposit. Here small 

 boulders and bones occur, the latter much shattered; but Elephas 

 jyrimigenius, Rhinoceros tichorhinus (?), Bison prisons, Cervus taran- 

 dus, Equus, etc., have been identified. The boulders are Sarsen- 

 stone, and there are small fragments of flint. Shells of Pupa 

 marginata, Helix Jiispida, and H. pidcheUa have been found. The 

 drift (which is widely spread) is from 150 to 260 feet above the 



DECADE II. — VOL. IX. NO. III. 9 



