186 



REPTILTA 



CLASS III 



directed internal nares are scarcely if at all covered by a secondary develop- 

 ment of the palatine plates. The mandible is without a coronoid process, and 

 the rami are fused at the symphysis. Their oral 

 borders are sharp, and were probably once encased 

 in horn. 



Pmx 



Fig. 291. 



Pig. 292. 



Dicynodon pardiceps, Owen. Karoo Formation; Fort Beaufort, Cape Dicynodon pardiceps, Owen. 



Colony. Palatal aspect of skull, i/ 4 - '"'> Basioccipital ; c, Maxillary tusk Anterior aspect of humerus, !/ 4 . 



(fractured); ju, Jugal ; mx, Maxilla; pmx, Premaxilla ; pi, Palatine; pt, b, Delto-pectoral ridge ; e, Entepi- 



Pterygoid ; qu, Quadrate (after ( )wen). condylar foramen (after Owen). 



The scapula is a very long bone, similar to that of Monotreme mammals. 

 It bears an acromial process and is attached by its proximal end to the cora- 

 coid and epicoracoid. The humerus 



is short and excessively stout, with 

 an entepicondylar foramen ; ulna 



Fig. 293. 



Eurycarpus oweni, Seeley. Karoo 

 Formation ; Schneebergkette, Cape 

 Colony. Left fore-limb with impression 

 of dermal covering, 1/3 (after Owen). 



Fig. 294. 



Platypodosaurus robustus, Owen. Karoo Forma- 

 tion ; Cape Colony. Ventral aspect of sacrum and 

 right half of pelvis, il, Ilium ; isch, Ischium ; 

 o, Obturator foramen : pu, Pubis ; s 1 — s 5 , Sacral 

 vertebrae. 



and radius are separated. In the pelvic arch the three elements of each side 

 are fused into an innominate bone which joins its fellow in a median 



