88 Annals of tJie Soutli African Museum. 



front the pterygoid meets the transpalatine and palatine. Behind 

 the descending processes is a long narrow median bar. The anterior 

 portion of this is formed by the pterygoids in contact, but for the 

 greater part the pterygoids seem to be separated by a thin median 

 forward process of the basisphenoid. This process may be the 

 parasphenoid, but no suture can be traced between it and the main 

 body of the bone. Superiorly the pterygoid forms a thin bony plate 

 which is not anchylosed to its neighbour, but in places is completely 

 separated from it by matrix. 



At the back of the basisphenoid are two tubera which are strong 

 and but slightly in advance of the basioccipital condyle. 



Type. Crushed skull in sandstone. (S.A.M. Cat. No. 2671.) 



Locality. H miles E. of Homestead, Dunedin, Nieuweveld, 

 Beaufort West. 



Horizon. Beaufort Beds. (Cistecephalus zone.) 



3. SCYMNOGNATHUS SEREATIDENS, Sp. 11OV. 



(Plate XIII., figs. 2, 4. Text-fig. 11.) 



The type of this new species is the anterior two-thirds of a skull 

 and lower jaw found 3 miles WSW. of the homestead on the farm 

 Dunedin, Beaufort West, in a calcareous nodule. It is smaller than 

 either S. whaitsi or S. tigriceps, and slightly smaller than S. angusti- 

 ceps, although agreeing in general shape with the two former. It 

 differs from S. tiijriccps, S. angusticeps, and S. minor in having all 

 its teeth serrated behind in their lower halves. The incisors and 

 canines of S. tigriceps are worn down to a certain extent, and it is 

 just possible that the lower parts of these teeth might have been 

 serrated ; but the molars of the larger form certainly show no trace 

 of serration. 



The premaxilla, maxilla, and septomaxilla are as in S. ticjriceps, 

 the septomaxilla having an anteriorly directed turbinal which divides 

 the nares almost completely into upper and lower portions. 



The dental formula for the upper jaw is i5 cl w4. The first two 

 incisors are smaller than the others ; the largest are the third and 

 fourth. The five incisors occupy a space of 38 mm. They are 

 serrated on the posterior border. On the 3rd, which is the most 

 perfectly preserved, the serrations begin 7 mm. below the edge 

 of the premaxilla and continue almost, if not quite, to the point of 

 the tooth. On the same tooth in a distance of 14 mm. there are 

 36 serrations. The maximum width of the 3rd incisor is 7 mm., and 



