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12. On some Gorgonopsian skulls in the collection of the South 



African Museum. By S. H. HAUGHTON B. A.. D. Sc., 



F. G. S., Hon. Curator of the Palaeontological Collections. 



(With 8 Text-figures). 



In a recently published paper (''The Bases of Classification of the 

 Theriodontia", I 'roc,. Zool. Soc. 1921, p. 35) Watson has described 

 in some detail the Gorgonopsian and Therocephalian types in the 

 possession of the British Museum which are sufficiently well pre- 

 served to show those features of the skull which have an important 

 bearing on the interrelationships of the Therapsid Reptiles: and has, 

 at the same time, drawn attention to the fact that a number of the 

 types belonging to other Museums are somewhat imperfectly known. 

 The following notes are based upon a study of Gorgonopsid skulls 

 which an- in the collection of the South African Museum, anil are 

 mainly observations additional to those which occur in the original 

 descriptions of the various specimens. 



The forms discussed are: 



1. Galesuciiu* yracilis Htn. - Tupinocephaliis /one. 



2. Scylacops capenxis Br. - Lower half of Cistecephalus /one. 



3. Aelurognatkus tigricepx ( Br. c^s: Htn.) - Lower half of Cistece- 

 j>lial/ts zone. 



4. Aelwrognathus serratidens (Htn.) Lower half of Cistece- 

 jilittl-iffi /one. 



5. Gorgonognnthua lonyifron* Htn. Lower half of Cistecepha- 

 lus zone. 



0. Arctognathus wl/aifsi Htn. - Middle of Cistecephalus zone. 



7. Si/cosaurus laticeps Htn. Middle of Cistecephalus zone. 



8. An unnamed form. Middle probably of Cistecepltalus zone. 



GALESUCHUS GRACILIS, Htn. 

 1915. Haughton. Ann. S. Afric. Mus. XII, 3, p. 82. Fig. 10. 



This form is of great interest as being the earliest known Gorgo- 

 nopsid. The type and only specimen came from the lower part of 

 the Tapinocephalus zone; and it is unfortunate that the specimen 

 is not more perfect. The snout is missing: the zygomatic arches 

 are almost weathered away ; and the natrix is so intractable that 

 it has not yet been possible fully to develop the palate and basi- 



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