3-1 



3-1 



2-7 



2-3 



2-1 



2-0 



4-7 



4-1 



3-7 



3-2 



3-2 



2-7 



4-1 



3-9 



3-1 



2-0 



2-4 



2-0 



<? 



7-8 



6-1 



4-8 



4-3 



, , 



. 14-6 



13-8 



, , 



8-2 



7-0 





126 MAEINE EEPTILES OF THE OXFOED CLAT. 



CaudaU. 



Lengtli of centrum in mid-ventral line 

 Width of hinder end of centrum . . 

 Height of liiuder end of centrum . . 

 „ to top of neural spine . . . 

 Width between outer ends of caudal ril 



Fore paddle (test-fig. 63, B) : total length 72-0 



Humerus : length 2o'2 



greatest width at upper end (witli tuberosity) . . 9-1 



least antero-posterior width. of shaft 6'3 



greatest width at lower end 14-1 



Eadius : greatest length 7'2 



„ width 7'1 



Ulna : greatest length 4-9 



,, width 6"1 



The lengths of the successive phalanges of the longest (fourth) digit are : — 4"1, 4'0, 

 3-8, 3-5, 3-3, 3-1, 2-ti, 2-5, 2-0, 1-8, 1-4, TS, I'l, -8. 



Hind paddle (text-fig. 63, A) : total length 70-5 



Femur: length 23-8 



greatest width at upper end 7'4 



least antero-posterior width of shaft 5'0 



greatest width at lower end 12-2 



Tibia : greatest length 5'0 



„ width 6'5 



Fibula : greatest length 4'7 



„ width 5-9 



The lengths of the successive phalanges in the longest (fourth) digit are: — 4'1, 3"9, 

 4-0, 3-6, 3-4, 2-8, 2-6, 2-3, 2-0, 1-7, 1-4, 1-1, -9. 



E. 3704. Shoulder-girdle of an old individual, probably of this species. In ibis specimen 

 (text-fig. 62) the ossification of the bones seems to have proceeded further than in any 

 other; this is especiallj- notable in tbe posterior region of the coracoids, which are 

 produced backvi'ards with well-marked postero-lateral processes and less developed 

 median processes not seen in younger examples. The scapulae and coracoids meet in 

 the mid-ventral line, and the interclavicle (PL YI. figs. 6, 6 a) is preserved in an almost 

 perfect state. The middle of its anterior border is marked by a shallow concave 

 notch (a.n.), the edge of which is smooth ; on either side of this the convex anterior and 

 lateral edges of the bone are thin and with numerous small indentations. Posteriorly 

 there seems to have been a short pointed process ip-p), the continnation backwards of 

 a median ridge, seen on the ventral face of the bone ; this ridge begins anteriorly as a 

 broad very slightly convex surface, and narrows backwards to this posterior point. 

 The ventral surface seems to have been gently convex from side to side, the dorsal 

 surface concave in the same direction. Crossing the dorsal face of the bone from side 

 to side, at about two-thirds of its length from the anterior end, is a broad convexity, 

 behind which the bone is slightly concave from before backwards. 



