376 Miscellaneous, 



made the type of a genus Esoterodon. A small skull from Molteno 

 Pass, Cnjptociinodon simus (sp. n,), is regarded as an Endothiodont 

 with imperfectly-developed canine teeth The Endothiodontia have 

 no incisor teeth, have the hard palate imperfectly developed, and 

 no coronoid process to the lower jaw. 



Another South-African group is regarded as indicated by Delphino- 

 rjaathus, Tapinocephalus, and a new genus named Dinocephalus, 

 which has the largest tusks known in any South-African genus, 

 associated with small molars. In the typical genera the skull- 

 bones are very thick and the temporal vacuities small, ^luro- 

 saurus is probably to be placed in this group. It is referred to as 

 Dinocephalia. 



Thus there is a series of groups of South- African Reptilia which 

 appear to agree in having a palate which has some resemblances to 

 Mammals but approximates to Sphenodon, Lizards, and Crocodiles. 

 All these sub-orders are combined as the Therosuehia. In this 

 order or group may be included the Deuterosauria from the Permian 

 rocks of Eussia. 



The Deuterosauria is distinguished from the Theriodontia by 

 having palato-nares which open by oval vacuities on a concave 

 surface instead of behind a hard palate. The transverse palatine 

 arch is not developed downward. The sphenoidal region is at an 

 angle with the palate, and in the same plane with the occiput. 



Finally, the names given by Professor Cope to allied American 

 types are examined. It appears that the Theromora as hitherto 

 used is a synonym of the Anomodontia, though it might be con- 

 veniently limited to the American types, which appear to be distinct 

 from those of Africa and Europe. But it is not possible to use 

 either that name or the names Pelycosauria or Cotylosauria till the 

 characters of the groups they indicate are adequately defined by 

 good characters. 



The relation of the Therosuehia to other Anomodontia is shown 

 in the following grouping : — 



ANOMODONTIA. 



Thkrosuchia. 



Pareiasauria. 



Procolophonia. 

 Gorgonopsia. 

 Dinocephalia. 

 Deuterosauria. 



(Lycosauria. 

 Cynodontia. 

 (lomphodontia. 

 Endothiodontia. 

 [Theromora.] 



TnEROCHKLONIA. 



Dicynodontia. 



Kistcccphtilia. 

 Mesosaukia. 

 — Prom the Proceedings of tJu Royal Society. (Communicated by 

 the Author.) 



