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4. — On the Inter -relationships of the Knotun Therocephalian 

 Genera.— By E. Broom, M.D. 



When the palate of the primitive Permian " Theriodonts " was 

 discovered, it became manifestly impossible to retain them in the 

 same group as the Triassic " Theriodonts," such as Galesaums. 

 In these Triassic forms there is the typical mammalian secondary 

 palate, but in the former the palate is a modification of the 

 Rhynchocephalian type, and thei-e are many other distinguishing 

 characters. I therefore proposed in 1903 the name Therocephalia 

 for the Permian forms, and 0\Yen's name, Cynoclontia, proposed in 

 1861, should be retained for the higher types in preference to the 

 name Tlicriodontin, proposed in 1876, the retention of which latter 

 name can only give rise to confusion. 



In 1890, when Lydekker's Catalogue of the British Museum 

 Reptiles was published, only 6 Therocephalian genera were known, 

 and 2 others which are doubtfully referred to the Therocephalia. 



Seeley, in 1895, described an additional species Pristerognatlms. 



Within the last four years a considerable number of new forms 

 have been discovered, and it seems advisable to review the present 

 state of our knowledge of the group. 



The following are the species which have been described and 

 which I believe to be distinct. A "?" is placed at those which 

 may not be Therocephalians, and one which is too imperfectly 

 known to be certainly distinct is placed in brackets : — 



Cynochampsa laniaria, Owen (1860). 

 Lycosaurus pardalis, Owen (1876). 

 Lycosaiirus tigrinus, Owen (1876). 

 Lycosaurus curvimola, Owen (1876). 

 Tigrisuchus simus, Owen (1876). 

 Gynodraco serridens, Owen (1876). 

 Cynodraco major, Owen (1876). 



