184 



MAEINi: EEPTILES OY THE OXFOED CLAT. 



prominent ; it has been suggested that it may be homologous with the lateral process 

 of the Chelonian pubis. 



The symphysial surface (PL X. fig. 3 b) is deeper and at the same time shorter than 

 in Murcenosaunis ; its form will be best understood from the figure. The curvature 

 of the symphysial border shows that even when ossification was far advanced, as in the 

 specimen figured, the actual contact of the two bones, if present at all, must have been 

 short, they being separated anteriorly and posteriorly with wedges of cartilage : the 



Text-fig. 91, 



a.o. 



mcjr 



mty. 



Proximal portions of fore and liind paddles of Cryptodeidus oxoniensis : A, right fore paddle 

 (upper surface) ; B, left hind paddle (upper surface). (E. 2860, about \ nat. size.) 



a.o., accessory ossicle ; /., fibula ; fern., femur ; Jib., fibulare ; h., head of humerus and femur ; 7l^(m., humerus ; 

 wi<., intermedium ; ?)ic.F'., fifth metacarpal ; Tni.F., fifth metatarsal; r., radius ; rad., radiaXe ; t., tibia ; 

 tib., tibiale ; tr., trochanter of femur ; tu., tuberosity of humerus ; u., ulna ; zdn., ulnare. 



anterior cartilage was probably small and continuous with the cartilage bordering the 

 front of the pubis ; the posterior cartilage, on the other hand, was thick and probably 

 was continuous with that uniting the symphysial surfaces of the ischia, thus completely 

 separating the foramina oUiiratoria from one another. 



