126 MAEINE EEPTILES OE THE OXFOED CLAY. 



out from the central ridge so marked in St. hulJcei; but the variation of the form of the 

 scutes in different parts of the series and in different individuals makes comparison in 

 this respect unsatisfactory. 



This species is distinguished from St. edwardsi* in several respects: thus in that 

 form (1) the frontals terminate in front in an acute angle at the level of the anterior 

 points of the prefrontals ; (2) the premaxillse extend further back and are not quite so 

 widely separated from the nasals ; (3) the form of the maxillo-premaxillary suture on 

 the palate is different, the two not interlocking in the manner seen in St. diirobrivensis. 

 In St. heberti f there are 39-40 teeth in the upper jaw instead of 33-34. The hinder 

 end of the symphysis appears to be opposite the twenty-seventh or, in one specimen, 

 the thirtieth tooth. In St. intermedins there are thirty-eight or thirty-nine teeth in 

 the upper jaw and thirty-seven or thirty-eight in the lower, the hinder border of the 

 symphysis being opposite the thirty-second. In this species also the symphysis forms 

 about 52 per cent, of the total length of the mandible, while in St. diirobrivensis the 

 proportion is about 44 per cent. In St. larteti the anterior border of the frontals and 

 the maxillo-premaxillary suture differ in form from those of the present species ; in 

 St. larteti also the anterior angle of the nasals seems from Deslongchamps' figure to 

 come about opposite the alveolus of the eighteenth maxillary tooth. 



R. 3701. Nearly complete skull and skeleton. The parts preserved are skull (PI. VI. figs. 1, 2), 

 mandible, teeth ; atlas, axis (text-figs. 34, C, D), and eight other cervical vertebra? 

 (text-figs. 35, C, D), twelve dorsals (text-fig. 37), two lumbars, two sacrals (PI. VI. 

 figs. 6, 6 a), thirty-eight caudals (text-fig. 38, A, B, C) ; cervical and dorsal ribs (text- 

 fig. 39) ; chevrons ; scapula;, coracoids (text-fig. 41, A) ; humeri, radii, and ulna? 

 (text-fig. 42), pubes, ischia, ilia ; femora, tibia?, fibula?, and many bones of the hind 

 feet; scutes (PL VI. figs. 4, 5). Type specimen described loc. cit. supra. 

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



Skull (PI. VI. figs. 1,2): 



Total length 74-0 



Length in front of orbit 45-0 



Width between outer angles of quadrate 24-0 



Length of temporal fossa? (inner side) 18-0 



Width of temporal fossa; (inner side) 8 - 8 



,, frontals between orbits 5-4 



„ middle of snout 6-4 



Width behind premaxillaiy expansion 4-8 



Width of premaxillary expansion 5 - 7 



* Deslongchamps, Bull. Soc. Linn. Normandie, ser. 2, vol. i. (1868) p. 155, as Teleosaunts ; see also 

 Deslongchamps, Notes Paleontologiques, p. 239. 



t Morel de Glasville, Bull. Soc. Ge'ol. France, ser. 3, vol. iv. (1876) p. 342; also vol. viii. (1880) p. 318. 



