130 MAEINE EEPTILES OF THE OXEOED CLAY. 



Ilium : length of dorsal border 10 - S 



height from acetabular edge to dorsal border .... 7-9 



length from anteroinferior to postero-superior border . 13'0 



Eemur : length in straight line 3o - 5 



greatest width at proximal end 6 - 3 



long diameter of middle of shaft 4'1 



short diameter of middle of shaft 2-S 



Tibia : length 17T 



width of proximal end 4 - 9 



„ distal end 4 - 8 



Eibula : length 15-9 



E. 2073 (Leeds Coll. 1). Imperfect skull and mandible, seven cervical vertebrae and fifteen 

 dorsals, ilia, iscbia, femora, tibise (one imperfect), fibula, and some bones of the hind 

 foot. 



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



Ilium: length of dorsal border (approx.) 10'5 



height from acetabular to dorsal border 7'9 



length from anteroinferior to postero-superior angle . 13-2 



Eemur : length in straight line 34-3 



greatest width of head 6-0 



Tibia : length = . . . 16-0 



Steil80SanrHS obtlisldens, Andrews. 

 [Plate VII.; text-fig. 50.] 

 1009. Steneosaurus obtusidens, Andrews, Ann. Mag. Nat. Hist. [8] vol. iii. p. 306, pi. ix. fig. 2. 



Type Specimen. — A considerable portion of a skeleton of a very large individual. 

 The parts preserved are skull and mandible (figured and described, loc. tit. supra, 

 pi. ix. fig. 2, also PI. VII. fig. 1), numerous teeth (PL VII. figs. 2-4), atlas, axis, and 

 five other cervical vertebras, eleven dorsals, two sacrals (text-fig. 50), nineteen caudals 

 (PL VII. fig. 5), numerous cervical and dorsal ribs, chevrons, one scapula, parts of 

 the humerus, ulna, ilia, ischia (PI. VII. fig. 7), part of one pubis, right femur and 

 part of left, tibia, fibula, astragalus, calcaneum and other bones of the hind foot, and 

 numerous scutes (PL VII. fig. 6), mostly broken. (R. 3168.) 



This species is distinguished mainly by the form of the teeth (PL VII. figs. 2-4), 

 which are blunt and rounded at the tips ; the enamel bears a sculpture of fine ridges, 

 parallel to one another in the lower part of the crown, but more irregularly arranged 

 on the summit ; on both the anterior and the posterior faces there is one more strongly 

 marked ridge running from base to summit of the crown. It should be noted that 

 some of the replacing teeth in the type skull of St. durobrivensis are of somewhat 

 similar form, and although other differences between that species and the present one 



