730 R. BROOM 
generically with Inostrausewia. Certainly it is closely allied, and 
certainly Inostrausewia is a Gorgonopsian. ; 
If I were shown the Russian Dicynodonts and were told they 
had come from South Africa and were asked from what zone I 
thought they had come I should unhesitatingly say that they must 
come from the Cistecephalus zone. Nothing like them is known from 
any of the earlier zones and in the Czstecephalus zone we get Dicyno- 
donts strikingly similar. I have therefore little hesitation in affirm- 
ing that the Russian fauna of the Dwina is the fauna of our South 
African Cistecephalus zone, and this confirms the view I expressed 
eight years ago, that the Cistecephalus zone represents our most 
recent Permian beds and that our typical Pareiasaurs are Middle 
Permian. In the present state of our knowledge we may regard 
our Pareiasaurian genera distributed as follows: 
Cisteceplalis ZOWCA arian eae Pareiasuchus, Propappus 
Endothrodon Zones ash ae ae ee ne Propappus, Anthodon 
IZOKCVES GUUS ZONC aa ee ae ee ee Pareiasaurus 
