900 ROBERT COLLETT, 



The frontalia are in front very broad and inflated, but contract 

 somewhat behind along tbe orbitae. The narrowest portion of the 

 forehead is, however, comparatively broad, or about equal to the 

 base of the four molars. On account of their Inflation, they fall obli- 

 quely towards the nasalia. The sutura frontalis has almost no de- 

 pression, and the forehead above the inflated central portion is almost 

 flat ; postorbital processes are wanting, but in their place two (slightly 

 perceptible) ridges, directed obliquely downwards, are present. 



The frontal crests are low, and converge somewhat in their course 

 on the parietalia, without however meeting; they turn aside outside 

 the interparietale, and join, without touching this bone, the occipital 

 crests. The part thus enclosed by the frontal crests forms an ele- 

 vated area, which is raised above the other parts of the parietalia. 

 Somewhat to the front of the end of the interparietale, each parietale 

 is perforated by a foramen (which I cannot discover in the other 

 Macropodidae which have come under my notice); in the skull of a 

 young individual (length 106 mm) it is indistinct on one side. 



Interparietale, large, forming in front a blunt angle or arch, the 

 height of which is about equal to the base of the premolar. The 

 breadth is considerably greater than the height. 



Os zygomaticum, strongly bent, so that the lower orbital margin 

 is very deep and round. 



The exterior funnelshaped ear opening is very short and incom- 

 plete, as its upper wall is completely or partially wanting. The bony 

 mass in the other parts of the pipe is unusually porous. 



The palate is entire, and has no foramina palatina. 



The bullae osseae are almost imperceptible. 



Maxillare, short, but broad and with arched side walls. 



Intermaxillare , as the upper jaw, short and arched; the nasal 

 cavity is consequently very spacious, and the snout broad and short. 

 Its narrowest portion is below the centre, and is there but slightly 

 broader than the base of the upper premolar; it becomes broader 

 towards the nasale, being there, at the point of its greatest breadth, 

 about equal to the base of the three inner molars. The suture with the 

 Upper jaw is perpendicular to the nasal suture, without forming any 

 greater or less acute angle, as in the preceding Macropodidae, and 

 meets the nasal suture just in the middle. 



Foramina incisiva, short and broad, and their posterior margins 

 touching the upper jaw. 



