74 MAEINE EEPTILES OF THE OXFOED CLAY. 



posterior being procoelous, the convex hinder surface forming the occipital condyle, the 

 anterior concave face closely resembling the face of a vertebral centrum of ordinary 

 type. 



E. 2148 (Leeds Coll. 69). Fragments of mandible, three anterior cervical centra, and fifteen caudal 

 centra, including some from the bend of the tail and some of the small terminal bones, 

 the coracoids, and a femur of a young individual. 



The dimensions (in centimetres) of some of the bones are : — 



Cervical vertebral centrum : length 2-0 



height 4"4 



width 5-0 



Caudal centrum from bend of tail : length (at top) .... 1-5 



„ (at bottom) ... 1-0 



height 3-0 



width ....... 2-6 



Coracoid : length . 18'0 



breadth 16-0 



Femur : length 7*6 



E. 2137 (Leeds Coll. 63). Eleven posterior precaudal vertebral centra, three neural arches, many 

 ribs, the complete shoulder-girdle (coracoids, scapulas, cla'sacles, interclavicle) , one 

 complete ischio-pubic bone and the proximal end of the other. All these bones, which 

 are those of a large individual, are uncrushed and exceptionally well ossified. The 

 shoulder-girdle has been figured by Prof. H. G. Seeley in Proc. Roy. Soc. vol. liv. 

 (1893) p. 151, fig. 1 ; see also text-figs. 32-35. 



The dimensions (in centimetres) of some of the bones are : — 



Dorsal vertebral centrum : length 4 '5 



height 8-4 



width 10-2 



Neural arch : total height H-6 



width of spiue 3'9 



Coracoid (text-fig. 32) : greatest length 23-0 



„ width 20-3 



length of symphysial surface . (appros.) 14*5 



depth of symph3'sial surface . (approx.) 7'1 



length of glenoid surface . . (approx.) 10-0 



Scapula (te.\t-fig. 33, A &- B) : extreme length 24-0 



width of blade at narrowest . 4-4 



„ expanded lower end . 16"0 



length of glenoid surface . . 6-0 



width of glenoid surface . . 4'0 



Clavicle (text-fig. 34) : length along outside of curve .... 37'.5 



„ in straight line 34-5 



greatest width (in middle) 5'7 



