378 ROBERT COLLETT, 



Foramina palatina are wanting, but the palate is thin and partially 

 supplied with small holes. 



Foramina incisiva are formed by the intermaxillary alone, without 

 their lower margin touching the maxillaria. 



The condylus of the lower jaw is in all the specimens more or 

 less concave. 



The teeth. The dentition is (the young one excepted) normal; 

 it is, however, of course never complete. In four of the specimens 

 all the premolars, as well as one or more of the foremost molars, have 

 been shed ; in one specimen only , the immature , although very large 

 male specimen (D), the premolar {p '^) is still present in both jaws, 

 and its dentition is accordingly as follows: 



ii pi mi (28). 



In the oldest male (F) m ^ is wanting everywhere; in B the same 

 tooth has been shed in the left upper, and right lower jaw, and in 

 two specimens (C and E) m^ is only wanting on one side of the 

 lower jaw. 



Thenumberoftheteethisthus: — B:22; C:23; D:28; E:23; F:20. 



Of the Upper incisors i ^ has in the most specimens almost as 

 broad a margin as i ^ Both have a slight groove; i^ which is about 

 twice as broad as i ^, has a groove soraewhat in front of its ceutre, 

 and one in the middle of its anterior portion. 



Rudimentary sockets of the upper canines are visible, apparently 

 lying in the intermaxillary, but a fine suture always proceeds from 

 the bind margin of the sockets to the maxillary. 



As to the premolars no trace is found of ^ \ and, as above mentioned, 

 jP 2 is but present in the one specimen, the young male D. In this 

 it is small, directed obliquely forwards, and has 2 tubercles, of which 

 the inner one in the upper jaw is double. Its size is about equal to 

 the central incisor. 



The skull of the young one, in which the length is 105 mm, 

 the breadth 57 mm, and length of the lower jaw 80 mm, has as yet open 

 sutures, and the milk premolars are in use. It differs from the skull 

 of the fully grown specimen in its deep concave interorbital space, 

 which has everywhere an even breadth, whilst the orbital margins in 

 the old ones converge considerably behind; the frontalia are scarcely 

 swollen at all. 



Of the upper incisors i^ and i^ are comparatively large, even 

 larger than in some of the fully grown individuals ; i ^ has as yet not 

 riseu above the alveolar margiu. 



