182 MARINE REPTILES OE THE OXEORD CLAY. 



the hind foot. Some sclerotic plates are preserved. This skeleton, with others, was 

 described and figured by Hulke in Proc. Zool. Soc. 1888, pp. 418—433, pi. xvii. 

 figs. 2-5 (vertebrse), pi. xix. figs. 1-2 (ilium), text-fig. 2 (coracoid). There seems no 

 doubt that this specimen is a rather small individual of the present species. 

 The dimensions (iu centimetres) of this specimen are : — 



Skull: length in mid-dorsal line (approx.) 51-0 



„ from occipital condyle to tip of snout (approx.) 55-5 



, of the nasals 20'0 



distance between the nasals and premaxilla; .... 5-5 



least width between orbits 7'1 



width between outer angles of prefrontals 11-7 



„ „ „ „ frontal 12-5 



Mandible : length (approx.) 56 - 



depth at coronoid angle 65 



Vertebras Axis. 



Middle Anterior Posterior First Second Anterior Three vertebra; at 

 cervical. dorsal, dorsal, sacral, caudal, caudal. bend of tail. 

 Length of centrum in mid- , *- 



^ 



ventral line 2-9 3-0 3-3 3-3 3-4 3-2 2-6 2-1 1-8 1-7 



Width of posterior face of 



centrum 2T 2-6 (app.) 2-5 2-7 2-6 2-6 2-8 1-7 1-4 1-4 



Height of posterior face of 



centrum 2-5 2-6 (app.) 2-5 2-7 2-3 2-7 2-7 1-8 1-9 2-0 



Height to top of neural spine 5*6 6*6 . . . . . . . . . . 3-9 4'8 5 - 3 



The measurements of the vertebrse are only approximate, much crushing having 

 taken place. 



The length of the centrum of the first vertebra at the bend of the tail in the mid- 

 ventral line is 1*8 cm., in the mid-dorsal line 2'3 cm. ; the same measurements in the 

 second are 1*7 cm. and 2 - 4 cm. 



Shoulder-girdle : 



Scapula (text-fig. G9, A) : length 5"6 



width of articular end .... 1-9 



„ shaft at narrowest point. 1*0 



„ upper end l - 3 



Coracoid (text-fig. 69, A) : length 6-0 



width of upper eud 3 - 5 



„ shaft at narrowest point 1*4 



,, lower end . (approx.) 4'0 



Humerus : length 5-8 



width of head 1*7 



,, distal end 1-6 



Pelvis : 



Ilium (Bg. by Hulke, lorn. cit. pi. xix. figs. 1,2): 



length of the dorsal border 3-8 



„ from antero-superior to postero-inferior angle . 5-3 



,, of the acetabular border 40 



