192 Annals of the South African Museum. 



bone playing little or no part in the symphysis. The post-dentary 

 part of the jaw is seen partly in external view and partly as a 

 cast of the inner side. The structure is somewhat difficult to 

 determine as a certain amount of crushing has obliterated the 

 sutures. There, is a long posterior process lying ventrally as in 

 Cynognathus presumably part of the angular, which is much 

 shallower anteriorly than in Scymnqgnathus. The prearticular 

 and surangular are seen occupying their normal positions, but 

 the actual articular surface is missing. 



Although in the general character of its palate and occipital 

 plate the form approximates to the Gorgonopsia, it differs from 

 that group in the narrow parietal crest, the absence of the pre- 

 parietal, and the absence of the vomer on the palate. It has 

 been shown, too, that it differs also from the typical Theroce- 

 phalia, Cynodontia, and Bauridae ; and I have therefore placed 

 it in a new genus under the name WJiaitsia platyceps named in 

 honour of the Rev. J. H. Whaits, to whose zeal, energy, and 

 knowledge as a collector South African palaeontology owes such 

 a debt of gratitude. This new genus may be considered as the 

 type of a new family of Therapsida, the Whaitsidae. 



Type. Skull and partial lower jaw. S.A. Mus. Cat. No. 4006. 

 Co-type. Skull and lower jaw. S.A. Mus. Cat. Xo. 4330. 

 Locality.- Zuurpoort, Graaff-Reinet District, C.P. 

 Horizon. Lower Beaufort Beds, Cistecephalus zone. 



AKIDNOGNATHUS PARVUS n.g. et n. sp 



The type skull of this species shows some interesting features. 

 It was collected from the Cistecephalus zone of the Lower Beaufort 

 Beds at Zuurpoort, Graaff-Reinet, C.P., by the Rev. J. H. Whaits. 

 (S.A. Mus. Cat. No. 4021.) 



The skull is small, the snout broader than high. Its greatest 

 length is 107 mm., the greatest breadth 54 mm. The distance 

 from the snout to the front of the orbit is 50 mm., the anterior- 

 posterior diameter of the orbit 25 mm., and the interorbital width 

 22 mm. 



The dental formula is doubtful ; it may be i5 c2 m7 or i6 cl m7. 

 The sixth tooth from the centre line is smaller than the other 

 incisors, and it is not possible to determine absolutely whether 

 it is carried by the premaxilla or the maxilla. In Scaloposaurus 

 and Ictidoynathus the number of canines is greater than one, and 



