PRE-JURASSIC TETRAPODS. 177 



Fam. Cynognathid,e. 



Cynognathus Seeley. M. Trias, S. Africa. 



Diademodon 

 Trirachodon ,, 

 Cynochampsa Owen, 



55 55 

 5 5 5 5 



5 5 5 5 



Fam. Nythosaurid^e. 



Galesaurus Owen. M. Trias, S. Africa. 

 Nythosaurus ,, 



55 



Sub-Order Thebocephalia Broom. 



Tlierioclonts with a narrow intertemporal bar formed mainly 

 by the parietals. No secondary palate. Large suborbital 

 vacuities. 



Scylacosaurus Broom. M. Permian, S. Africa. 



Lycosaiwus 

 Alopecodon 

 Hycenosuchiis 

 Pardosuchus 



55 15 J5 



55 55 51 



55 55 55 



55 55 55 



etc. 



Sub-Order Ba uriamorpha. 



Theriodonts with short temporal vacuities separated by the 

 parietals. A secondary palate and large suborbital vacuities. 



Bauria Broom. M. Trias, S. Africa. 



Microgomphodon Seeley. M. ,, ,, 

 Sesamodon Broom. ? L. ,, ,, 



Melinodon Broom. M. ,, ,, 



Super-Order CHELONIA. 



Reptiles with a roofed skull and the middle eight of the ten 

 dorsal vertebrae provided with widened ribs, supporting a dermal 

 armour. 



Order Eunotosauria. 



?if rightly referred. 



Chelonia with costal plates not fused with the ribs and the 

 pectoral and pelvic girdles not within the ribs. 



Euuotosaurus Seeley. M. Permian, S. Africa. 



Order Testudinata. 



Chelonia with the pectoral and pelvic girdles within the dorsal 

 ribs. 



Family Pleurodeira. 

 Testudinates which withdraw the head sideways. 



