123 MARINE EEPTILES OF THE OXEOED CLAY. 



Ischium: length of syrnphysial border . . . . (approx.) 14-5 



width from articular end to posterior angle . . . 13-0 



„ of neck at narrowest 3-8 



greatest width of proximal end 5*7 



Pubis: greatest length 12-9 



width of lower expansion 6-2 



„ shaft at narrowest point 1-1 



„ upper end 2-3 



Hind limb : 



Eemur : length in straight line 31-4 



greatest width of proximal end 5-0 



long diameter of the middle of the shaft .... 3-0 



short diameter of the middle of the shaft .... 2-3 



Tibia : length 14-0 



width of proximal end 3-8 



„ middle of shaft 2-3 



„ distal end 3 - 5 



Fibula: length ]3-l 



First metatarsal : length 9-3 



R. 2865 (Leeds Coll. 28). Imperfect skeleton. The parts preserved are: — Skull; atlas, axis, 

 and seven other cervical vertebrae, fourteen dorsals, two sacrals, and twenty-three 

 caudals ; cervical and dorsal ribs ; chevrons ; ischia, one pubis, femora, tibiae, and 

 fibula, numerous bones of foot and many scutes. 



This skeleton is that of a larger and presumably older individual than the type 

 specimen. The skull differs in some details : e.g., the rostrum appears to be relatively 

 a little longer. It approximates in form to the specimen figured by Auer as St. larteti, 

 var. kokeni. The diagrammatic text-figures nos. 31—33 are founded mainly on the skull 

 of this specimen. 



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



Skull : 



Total length from tip of snout to occipital condyle .... 93-5 



Length in front of orbit 58 - 9 



"Width between the outer angles 



,, of the quadrates (approx.) 31-2 



Length of temporal fossas (inner side) 22-5 



"Width of temporal fossa? (anterior end) 9*8 



,, frontals between orbits 7 - l 



,, snout at anterior end of nasals 8-2 



., snout behind the preinaxillary expansion .... 5\5 



* ., preinaxillary expansion (crushed) 7 "5 



* Somewhat exaggerated by crushing. 



