Investigations in South African Fossil Reptilia and Amphibia. 89 



its length below the edge of the bone 25 mm. The following gives 

 the length of the incisors: /I, 19 mm. ; ?2, 21 mm. ; /3 25 mm. ; 

 4, 24 mm. ; i5, 20 mm. In section the teeth are oval. There is a 

 diastema of 21 mm. between the last incisor and the canine. The 

 canine is very long, reaching almost to the bottom of the mentum, 

 55 mm. below the edge of the maxilla, pointed and backwardly 

 curved. It is serrated behind in its lower half. Behind is a 

 diastema of 15 mm., and then come four molars occupying a space 

 of 24 mm. These are simple, pointed teeth, serrated posteriorly in 

 their lower halves. The first molar has 14 serrations in a distance 

 of 4 mm., the whole length of the crown being 10 mm. All the 

 teeth are implanted in very deep, distinct sockets. 



The prefrontal forms the upper and anterior quadrant of the 

 orbital border. The frontal is 85 mm. long, and just forms part of 

 the orbital border, being almost shut out from it by the prefrontal 

 and postf rental. The relation of the frontal to the orbital margin in 

 this genus is a variable one. In S. angusticeps the frontal forms 

 a considerable part of the margin ; in this species it is almost 

 excluded from it ; while in S. tigriceps and S. icJiaitsi it is very 

 doubtful whether it plays any part in the border at all. In 

 Galcsuchus and Gorgonognatlius the frontal forms but a small part 

 of the border, while in Scylacops it is completely excluded by the 

 junction of prefrontal and postfrontal. 



The median preparietal is bounded by the frontals and parietals, 

 with which it articulates by interdigitating sutures. It is oval 

 in shape, 30 mm. long and 17 mm. broad, and is situated at the 

 level of the postorbital bar. The pineal foramen is large and lies 

 5 mm. behind the preparietal. 



The hinder part of the cheek below and in front of the orbit is 

 very much hollowed out. The slope from the front of the orbit 

 is very abrupt, while that from the maxilla is much more gentle. 

 This concavity is much more pronounced than in S. tirjnccps. 



The nasals are long, but not convex, sloping upwards from the 

 face to form a prominent sharp median ridge which extends back as 

 far as the frontals. 



The lower jaw has the mentum relatively less deep than that 

 of S. tigriceps, and a backward slope so that the point of the jaw 

 comes directly below the canine. 



The chief features of the species are its comparatively small size, 

 the possession of serrated teeth, of a ridge on the top of the snout, 

 and the pronounced backward slope of the front of the lower 

 jaw. 



