364 Annals of the South African Museum. 



length 3 mm. The first 5 together measure 22 mm. The large 

 canine measures 11 mm. in length, and is thus relatively larger 

 than in A. prismis. Behind it are the remains of the root of a 

 deciduous canine similar to that found in a number of other 

 Therocephalians. 



The nasals are long and narrow. Posteriorly they broaden out 

 considerably. In front they are imperfect. There are evidences of 

 pitting on the anterior part of the bone. 



The frontal region is badly preserved, but the interorbital 

 measurement is probably about 30 mm. The parietals form a pro- 

 minent median ridge. The shape and relations of the postorbital 

 bone are as in better-known Therocephalians. 



In one of the orbits is seen a scale-like bone, which is probably a 

 sclerotic plate. 



There are a number of small rounded teeth on the pterygoid 

 bones. 



Columellae cranii are preserved as in A. priscus. 



The mandible is very similar to that of the larger species. 



Hy^nasuchus Whaitsi, g. et sp. nov. 



This new genus and species is represented by a nearly perfect 

 skull, obtained at Eietfontein, 30 miles N.E. of Prince Albert, by 

 the Eev. Mr. J. H. Whaits, whose conspicuous enthusiasm has 

 been rewarded by the discovery of a number of new types, both of 

 reptiles in the Karroo Beds and of molluscs in the Bokkeveld Beds. 



In general this genus resembles Lycosuchus, but differs in having 

 6 incisors and 4 molars instead of 5 incisors and 1 molar, as in the 

 latter. The type species is rather larger than Lycosuchus vanderrieti. 

 The length of the skull is 280 mm., and the greatest breadth is 

 152 mm. 



The premaxilla is of the usual structure, and carries 6 large pointed 

 teeth. Each tooth appears to have 2 edges, a posterior and an 

 antero-internal, and both edges are serrated. The total length of the 

 incisor series is about 53 mm. 



The maxillary bone is fairly well preserved. Its anterior end lies 

 above the front of the 4th incisor. There is less of a transverse 

 ridge for the support of the lip than in Lycosuchus. There are two 

 large canines with anterior and posterior edges, which are probably 

 both serrated. On the right side the anterior canine is broken off 

 at its base, but the posterior is nearly perfect. It measures about 

 55 mm. in height and about 15 mm. in length. On the left side 



