STENEOSAUEUS OBTUSLDENS. 133 



In the rest of the skeleton the similarity to that of St. durobrivensis is so great that 

 special description is unnecessary. In the case of the coracoid the ventral end is more 

 expanded than in that species, and the bone is very like that of Mycterosucltus 

 (text-fig. 54), but this expansion is probably merely the result of more extensive 

 ossification consequent upon advanced age. 



The dorsal scutes (PL VII. fig. 6) differ considerably from those of the other species. 

 The pits are mostly shallow and elongated ; they are arranged in lines radiating in 

 most cases from the middle of the keel, and sometimes almost running together to 

 form shallow grooves. 



E. 3168. Skull (PL VII. fig. 1) and mandible, teeth (PI. VII. figs. 2-4), atlas, axis, and five other 

 cervical vertebrae ; eleven dorsals, two (? three) sacrals (text-fig. 50), nineteen caudals 

 (PI. VII. fig. 5), numerous cervical and dorsal ribs, chevrons, one scapula, an imperfect 

 humerus, an ulna, ilia, ischia (PI. VII. fig. 7), one pubis, femora (one imperfect), 

 incomplete tibiae and fibulae, bones of the hind foot, portions of ventral ribs, and 

 numerous scutes (PL VII. fig. G). Type specimen, the skull and mandible of which 

 are described and figured in Ann. Mag. Nat. Hist. [8] vol. iii. (1909) p. 306, pi. ix. 

 fig. 2. The skull, though much broken, is less flattened than usual ; the vertebrae are 

 nearly all crushed and distorted. 



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



Skull (PI. VII. fig. 1) : 



Total length 116-0 



Length in front of orbit 7L0 



Width between outer angles of quadrates 37'5 



Length of temporal fossa (inner side) 33 - 



Width of temporal fossa (?) 14-0 



„ frontals between orbits 8-f> 



,, snout opposite anterior eud of nasals, (approx.) 9-0 



„ snout behind premaxillaiy expansion .... 7 - 3 



„ premaxillary expansion 9 , f> 



Mandible : 



Total length 137-0 



Length of symphysial region 5S 



Width at hinder end of symphysis 14-0 



,, narrowest point behind anterior expansion . . 6-2 



Vertebra: 



Atlas and 

 axis. 



Middle 

 cervical. 



Dorsals. 



Sacrals. 

 1st. 2nd. 



First 

 caudal. 



Anterior 

 caudals. 



Posterior 

 caudal. 



7-2 



6-5 



7-0 





5-3 



5-9 



6-7 



6-8 



5-4 



7-4 



7-6 



7-1 





7-3 



7-5 



5-0 



49 



4-2 



7-2 



7-2 



S-2 



5-8 



6-0 



7-0 



5 5 



5-S 



3-8 



Length of centrum in mid- 

 ventral line 12-0 



Width of posterior face . 5-8 



Height of posterior face . 



Height to top of neural 



spine .. 15-7 .. .. 14'5app. . . 16-1 14-8 10-0 



