864 DR. R. BROOM ON 



There is very little crushing. Nearer the front of the nose the 

 height is only about 25 mm. and the width 45 mm. The 

 maxillary bone is rather deeply pitted. The palate is broad 

 and flat behind and in front slopes upwards to the opening of the 

 internal nares. The prevomers are narrow slender bones which 

 in section ai'e seen to have thin vertical plates. The palatines 

 are apj^arently as in Scylacosaurus, but appear to approach each 

 other more closely in the middle line. The pterygoids have each 

 a very thin vertical plate which is closely placed against its 

 neighbour. 



There are apparently 6 incisors, though only evidence of the 

 last five are preserved. The anterior ones are fairly round on 

 section, but tlie last three are more flattened and have a posterior 

 edge wliich is not improbably serrated. The teeth decrease in 

 size as we pass backwards, the 6th being only about half the size 

 of the 4th. The last four teeth occupy a space of 20"5 mm. and 

 the whole six probably 30 mm. The diastema between the 6th 

 incisor and the canine is 9 mm. The canine at its base measures 

 10 mm. by 7 mm. Behind the canine is a diastema of 7 mm. 

 followed by 8 pointed molars. Each of the anterior molars has 

 an antero-posterior diameter of nearly 3 mm., and the whole series 

 occupies a space of 29 mm. 



The dentition of the lower jaw is mainly concealed in front. 

 Probably there are 3 incisors and 1 canine. The molars are well 

 shown on the i-ight side and are 8 in number, and occupy a. space 

 of 32 mm. There is no evidence of any serrations, and were they 

 present the specimen would be expected to show some of them. 



The dental formula is probably i. r, c. y, m. ^. 



There is some doubt whether this specimen belongs to the same 

 genus as Pristerdgnathus polyodon Seeley. The type is only the 

 front of a snout, and the number of molars is unknown, and only 

 a figure of the underside is given by Seeley. HoAvever, the two 

 specimens are probably from near the same horizon, and the 

 arrangement of the teeth, so far as known, is sufHciently close to 

 render it advisable to place this new species provisionally in 

 Seeley's genus Pristerognathus. 



Alopecorhinus parvidens, gen. et sp. n. (PI. XCI. fig. 9.) 



This new genus is founded on an imperfect snout discovered bj 

 Mr. Whaits at Beaufort West. It consists of the greater part of 

 the left maxillary and dentary and much of the right maxillary 

 and dentary. 



It resembles Pristerognathus platyrhinus in the broad short 

 nose and approximates in dental formula, but differs in having 

 a much more slender jaw and in the relatively smaller size of the 

 teeth, especially the molars, and in having a much shorter 

 precanine portion of the snout. 



The anterior upper incisors are lost but there is evidence of the 

 last three. The whole series probably measured 19 mm. The 



