132 MAEIXE EEPTILES OF THE OXFOED CLAY. 



Humerus : length 31-0 



greatest width at upper end 11'5 



diameter of head (approx.) 8"4 



width of shaft at narrowest 8'3 



dorsal end 19'1 



IHum : length 20-0 



greatest w-idth at upper end 6-4 



width of shaft 3"5 



greatest width of lower end 6"7 



Pubis : greatest length 26*5 



w-idth : 30-5 



length of acetabular surface 7'3 



., symphysial border (approx.) 20-0 



Ischium : width of upper end 9'3 



,, shaft 6-1 



,, lower expansion 21-2 



length of acetabular surface .... (approx.) 5-5 



R. 2861 (Leeds Coll. 18). Imperfect skeleton of a large indi-s-idual probably of this species, thougb the 

 plications round the edges of the cervical centra are less marked than usual. The parts 

 preserved are an imperfect and much broken skull (basioccipital, exoccipital, opisthotic, 

 and supraoccipital, figured in text-figs. 43, 45): a nearly complete mandible; atlas, axis, 

 and twenty-seven other cervicals, mostly with the fused arches and ribs broken away; 

 nine dorsal and two caudal vertebrae ; about twenty dorsal and cervical ribs, some 

 portions of ventral ribs ; portions of the acetabular region of the pelvis with the con- 

 stituent bones united ; left femur, both tibije and fibula;, tarsals, and sixty-three 

 metapodial bones and phalanges. 



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



Skull (text-figs. 43, 45) : 

 Length in mid-dorsal line from posterior end of the parietals 



to the tip of the snout 26-4 



Length from pineal foramen to tip of snout 20'9 



Transverse diameter of occipital condyle 2-9 



Vertical diameter of occipital condyle 2-9 



Length of basioccipital 4'3 



Greatest width at lateral processes 5-6 



Mandible : length 37-9 



„ of symphysis (approx.) 5-0 



width of articular surface for quadrate .... 3'1 



Vertebra; 



Atlas and Fifth 

 axis. cerTical. 



Tenth Twentieth Twenty-fifth TwentT-niuth 

 cerrical. eerTical. cervicaL cerTical. 



Mid- 

 dorsal. 



Mid- 

 dorsal. 



Anterior Middle 





caudal, caudal. 



Leugth of centrum in 

















mid-ventral line . . 



6-0 4-S 



5-0 6-0 



6-3 



6-3 



6-3 



6-2 



4-9 3-2 



"Width of posterior face . 



4-0app.4-8 



4-9 6-5 



7-1 



7-5 



8-1 



7-9 



S-3 5-9 



Height of po.'iteriorface . 



3-1 4-1 



4-2 5-3 



5-8 



6-3 



7-2 



6-9 



5-4 4-9 



