PRE- JURASSIC TETRAPOUf . • 177 



Fam. CYNOGNATIIID.E. 



Cynognathus Seeley. M. Trias, S. Africa. 

 Diademodon „ ,, ,, 



Trlrachodon ,, ,, ,, 



Cynochampsa Owen. ,, ,, 



Fam. Nythosaurid^. 



Galesaiorits Owen. M. Trias, S. Africa. 

 Nythosaurus ,, ,, ,', 



Sub-Order Therocephalia Broom. 



Tlieriodonts with a narrow intertemporal bar formed mainly 



by the parietals. No secondary palate. Large suborbital 

 vacuities. 



Scylacoscatrus Broom. M. Permian, S. Africa. 



Lycosaurus ,, ,, ,, 



Alopecodo7i ,, ,, ,, 



• Hycenosuchus ,, „ ,, 



Pardosuchus ,, ,, ,, 



etc. 



Sub-Order Bauriamorpha. 



Theriodonts with short temporal vacuities separated by the 

 parietals. A secondary palate and lai-ge suborbital vacuities. 

 Bauria Broom. M. Trias, S. Africa. 



Microgomphodon Seeley. M. ,, ,, 



Sesamodon Broom. ? L. ,, ,, 



Melinodon Broom. M. ,, ,, 



Super-Order OHELONIA. 



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

 doi'sal vertebrae provided with widened ribs, supporting a dermal 

 armour. 



Order Eunotosaiiria. 



? if rightly referred. 



Chelonia with costal plates not fused with the ribs and the 

 pectoral and pelvic gii'dles not within the ribs. 

 Euttotosaurus Seeley. M. Permian, S. Africa. 



Order Testudinata. 



Chelonia with the pectoral and pelvic girdles witliin the dorsal 

 ribs. 



Family Pleurodeira. 



Testudinates which withdraw the head sideways. 



