152 Annals of the South African Museum. 



The following are some of the principal measurements : — 



Width of nasal behind 14 mm. 



Width of nasal in front 18 



Depth of maxillary 46 



Length of incisor series 21 



Diastema between is and c^ 9 



From front of c^ to back of m9 46 



Height of upper c^ 32 



The type specimen was presented to the museum in 1881 by Mr. 

 J. R. Joubert, and was obtained near Beaufort West. 



SCYMNOSAUKUS FEROX, g. et Sp. nOV. 



The imperfect snout which has been made the type of this new 

 genus has evidently belonged to a reptile about the size of a Hyaena, 

 and which with the exception of Titanosuchus is the largest primitive 

 Theriodont at present known. The snout has been broken across 

 behind the third molar, and has been again split longitudinally through 

 the roots of the teeth, so that the specimen only consists of the 

 alveolar margins of the maxillary and premaxillary bones with the 

 teeth and the front portion of the lower jaw. The longitudinal 

 fracture reveals the structure' of the anterior part of the palate. 



Each premaxillary bone has 5 incisors. Posteriorly the bones 

 are overlapped by the maxillaries. Internally they form large sutures 

 with the pre vomers. 



Each maxillary supports 1 large canine and 3 small molars, and 

 shows evidence of there having been an additional canine lost. 

 The maxillary forms with the palatine a longitudinal suture a little 

 inside of the roots of the molars. There is no secondary palate. 



The internal nares are long, kidney-shaped openings lying internal 

 to the large canines. Internally they are bounded by the prevomers 

 and the palatines. 



The prevomers are very much broader than in Scylacosaurus, but 

 only form a small part of the hard palate. They articulate behind 

 with both the pterygoids and the palatines. 



The palatines articulate with the maxillaries in a similar manner to 

 that found in Scylacosaui-us. Near the posterior border of the 

 internal nares, however, the outer border of the palatine forms a 

 prominent ridge. I can find no evidence of teeth on the palatines. 



Of the pterygoids only the anterior part is preserved. They fit in 

 between the two palatines and articulate in front with the prevomers. 



