hcis *. 



Middle * 

 cervical. 



Lnst 

 cervical. 



Dorsal. 



First * 

 sacral. 



Middle 

 caudal. 



4-1 



4-1 



3-7 



4'5 



3-9 



4-0 



2-8 



3-6 



3-6 



3-4 



3-1 



2-S 



3-2 



3-4 



3-4 



3-3 



2-7 



3-3 



6-9 



9-0 



8-5 



6-8 



m 4 



S'2 



124 MARINE REPTILES OE THE OXFORD CLAY. 



Vertebra , , Atl t as . ,, 



(odontoid). 



Length of centrum in raid- 

 ventral line 2*0 



"Width of posterior face of 



centrum 2'6 



Height of posterior face of 



centrum ...... 2-9 



Height to top of neural spine 



The width between the outer ends of the anterior pair of sacral ribs is about 13*5 cm. 



Pelvis : 



Ilium*: length of dorsal border (with spine) ..... 7 - 8 



„ from dorsal border to acetabular edge . . . 5*8 



„ from anteroinferior to postero-superior angle 8*8 



Ischium * : length of symphysial border ....... 10*2 



width from articular surface to posterior angle . . 10 - 1 



„ of neck at narrowest 3 '3 



greatest width of proximal end 4*9 



Pubis*: length 10-8 



width of lower expansion (approx.) 4-0 



„ neck at narrowest 0*8 



„ upper end 2*1 



Hind limb : 



Femur: length in straight line 24*S 



greatest width of proximal end 4*2 



long diameter of the middle of the shaft .... 2'5 



short diameter of the middle of the shaft .... 1-7 



■width of condyles 2*8 



Tibia: length 11*3 



width of upper end 2*9 



., shaft at narrowest 1*7 



,, lower end 29 



Steneosaurus durobrivensis, Andrews. 



[Plate VI. 5 text-figs. 31, 32, 33, 34, C, D, 35, C, U, 37, 38, A, B, C, 39, 41, A, 42.] 



3 909. Steneosavms durobrivensis, Andrews, Ann. Hag. Nat. Hist. [8] vol. iii. p. 304, pi. viii. fig, 2. 

 1909. ? Steneosaurus larteti, var. kokeni, Auer, Palaeontographica, vol. Iv. p. 224. 



Type Specimen. — A nearly complete skeleton, including the skull (figured in Ann. 

 Mag. Nat. Hist. [8] vol. iii. (1909) pi. viii. fig. 2; also PL VI. figs. 1, 2), mandible, 

 teeth, atlas, axis (text-fig. 34, C, D), and eight other cervical vertebrae (text-fig. 35, C, U), 



* Figured by Hulke (Joe. cit. supra). 



