370 Annals of the Soutli African Museum. 



Cynosuchus suppostus, Owen (1876). 

 ? Scaloposaurus constrictus, Owen (1876). 

 ? Gorgonops torviis, Owen (1876). 



^lurosauTus felinus, Owen (1881). 



Therioclesmusjyhylarchns, Seeley (1888). 



[Hyorhynckus platyccps, Seeley (1889).] 



PristerognatJms piohjodon, Seeley (1895). 



Ictidosuchus jprimcBvus, Broom (1901). 



Lycosuchus vanderrieti, Broom (1903). 



Lycosuchus mackayi, Broom (1903). 



Scylacosaurus sclateri, Broom (1903). 



Ictidosaurus angusticeps, Broom (1903). 



ScymnosauTus ferox. Broom (1903). 



Glanosuchus macrops, Broom (1904). 



Pristerognathus haini, Broom (1904). 



Scymnosaurus warreni, Broom (1907). 



Alopccodon priscus, Broom (1907). 



Alopecodon rugosus, Broom (1907). 



HycenasucJmis whaitsi, Broom (1907). 



Trochosaurus acutus, Broom (1907). 



Pardosiichus ivhaitsi, Broom (1907). 



Arnognathus parvidens, Broom (1907). 

 ? Galechirus scholtzi, Broom (1907). 



In addition to the 3 forms which are queried as doubtfully 

 belonging to the Therocephalia, there are 2 others, viz., Ictidosuchus 

 yrimcevus and Arnognathus parvidens, which though manifestly 

 Therocephalians must be placed in a family by themselves. Most 

 of the others may conveniently be regarded as belonging to one 

 family. Lycosanrus, Tigrisuchus, and Gynodraco appear to belong 

 to a somewhat more advanced family, and they certainly occur at 

 a higher horizon than most of the others, but they are too 

 imperfectly known to admit of their position being determined to 

 any certainty. 



Alopecodon , Glanosuchus, Lycosuchus, Hycenasuchus, Pardosuchus, 

 Trochosaurus, and Pristerognathus all occur in the Pareiasaurus 

 beds, which may be regarded as somewhere near the middle of the 

 Permian age. Lycosanrus, Tigrisuchus, and Gynodraco are from 

 beds considerably nearer the top of the Permian, but no genus has 

 yet been found in beds which are Triassic with the doubtful 

 exception of Arnognathus. 



The older genera differ from the more recent in the larger number 



