122 MAEINE KFPTILES OF THE OXFORD CLAY. 



Pelvis : 



Ilium ; length of dorsal harder ...... (appros.) 7*7 



height from acetabular edge to dorsal border . . . 5"3 

 length from anteroinferior to postero-superior 



border ........... (approx.) 9-7 



Pubis J greatest length . . . 1O0 



width of lower expansion ..... (approx.) 4-7 



„ shaft at narrowest 1*0 



„ upper end ........... 1*9 



Hind limb : 



Femur: length 25-0 



long diameter of- middle of shaft ....... 2-3 



short diameter of middle of shaft !•" 



Tibia : length 11*6 



width of upper end . 3-2 



„ lower end ........... 2"8 



Steneosaurus hnlkei, n. sp. 



Type Specimen. — An imperfect skeleton, including the skull (wanting the tip of the 

 snout), an imperfect mandible, atlas, axis, and seven other cervicals, fourteen dorsals, 

 two sacrals, seven caudals, a number of dorsal ribs (mostly imperfect), sacral ribs, ilia, 

 ischia, pubes ; right femur, tibia, part of fibula, numerous bones of the hind feet ; 

 many scutes (R. 2074, Leeds Coll. 2). 



This specimen was in part described by Hulke in a paper entitled " Contribution to 

 the Skeletal Anatomy of the Mesosuchia, based on Fossil Remains from the Clays 

 near Peterborough " (Proc. Zool. Soc. 188S, p. 417). He there described the vertebral 

 column, pelvic girdle, femur and tibia, and the dermal armour, giving figures of 

 the axis (pi. xviii. fig. 6), a cervical vertebra (text-fig. 3), a dorsal (text-fig. 4). a 

 caudal (text-fig. 5), and a sacral with the sacral ribs (text-fig. 6). He also figures the 

 left ilium (pi. xix. figs. 3, 4), the ischium (pi. six. fig. 5), and the pubis (pi. xix. 

 fig. 6). 



This specimen has been usually regarded as representing the St. echvardsi of Des- 

 longchamps, but a detailed examination shows that it differs in several respects from 

 that form, and the name Steneosaurus hidkei is now suggested for it in honour of the 

 late Mr. J. W. Hulke, who contributed so much to our knowledge of the Mesozoic 

 lleptilia. 



In this species the snout is comparatively short and the nasals are separated from 

 the premaxillas by a shorter interval than in St. durobrivensis ; their anterior angle 

 is at the level of the thirteenth maxillary tooth ; the anterior angle of the palatines is 

 opposite the nineteenth maxillary tooth. The anterior angle of the frontals is blunt 

 and far behind the anterior angle of the prefrontals, a character which distinguishes 



