166 DR. R. BROOM ON 



of which the 5th, 6th, and 7th are larger than the others. The 

 whole series measures 16 mm. 



The nearest ally of this type is Scaloposaurus. From this 

 genus it differs in having 11 molars instead of 9, and in having 

 the postorbital arches completely formed. 



The British Museum specimen is registered R. 4096. 



Cerdodon tenuidens, gen. et sp. n. (Text-fig. 3.) 



This new genus and species is founded on a specimen collected 

 by Mr. T. Bain in the Gouph, S. Africa, in 1878. It consists of 

 the greater part of the somewhat crushed and imperfect skull 

 of a small Therocephalian. The specimen is in a hard nodule, 

 and only the left side has been displayed. The front of the snout 

 is for the most part weathered away, and the supra- and post- 

 orbital portions of the skull are either hidden in the nodule or 

 possibly missing. Still, the whole of the left maxilla and most 

 of the left jugal are fairly well preserved, and most of the left 

 dentary and a considerable part of the left angular. 



From the front of the orbit to the front of the maxilla is 

 39 mm., and the measurement to the front of the snout was 

 probably about 47 mm. 



Text-figure 3. 



Cerdodon tenuidens. 



Side view of skull as preserved. Nat. size. B.M. 49420. 

 Ju. Jugal; L, Lacrymal; Ifx. Maxilla. 



The front of the snout is too imperfect to show the number of 

 incisovs. There probably were five. Those remaining are slender, 

 pointed teeth. The canine is relatively small, measuring 4 - 5 mm. 

 in length and about 12 mm. in height. The molars are not well 

 preserved, but they are evidently numerous — possibly seven or 

 eight. Two of these in the upper jaw are each over 2 mm. in 

 diameter ; but what are probably the posterior three in the lower 

 jaw are small, and together occupy a space of Only 4 - 5 mm. 



