gß2 ROBERT COLLETT, 



The skull. Aisa youiig specimcn, in which the teeth are not 

 yet fully developed , although the size of the skull is about that of 

 the others. B is a mature male, C apparently a female. 

 Measuremeiits. B C 



Length of skull .■ 30 mm 31 mm 



Breadth across the zygomatic aiches .18 „ 18 „ 

 Height of skull (from the end of bulla) . 9 „ 9,5 „ 

 Interorbital space (least width between 



the orbitae) 6,8 „ 7 „ 



Breadth of skull between the ear- 



openings 13 „ 13,5 „ 



Length of zygomatic arch (to front mar- 



gin of orbita) 14 „ 14 „ 



Length of dental series in the Upper jaw . 15,5 „ 16 „ 

 Length of dental series in the lower jaw . 13 „ 13,5 „ 

 The skull is smooth, without crests; of the occipital crests there 

 is but a slight trace. The interorbital space is broad and flat, or 

 vcry slightly concave towards the sutura frontalis. 



The posterior margin of each nasale is rounded off towards the 



frontale. No trace of proc. postorbitales. On the lower side the pars 



mastoidea is swollen, as in Ph penicillata, and forms a smaller bulla 



just behind the larger one, with which it has completely coalesced. 



The foramina palatina are large, and extend to the centre of m* 



The teeth. The dentition is normal: i i-, c {^ p ^, m i (46). 



The dentition does not differ, as already mentioned by Water- 



HOUSE (1. c. p. 75), in auy respect from that of Ph. penicillata, as 



each tooth and its position appears to be exactly as in the latter 



species. 



The central incisors in the lower jaw are, however, in none of 

 the present specimens so diti'erent in size from the other incisors in 

 the same jaw, as in Ph. penicillata. They are nevertheless a trifle 

 broader than these, but scarcely longer. 



In A, the upper p ^ is just rising above the level of the socket, 

 while at the same time the milk tooth has not been shed, so that 

 both are present, and about equally long. In the lower jaw there is 

 as yet no trace of the permanent p'^, the place of which is occupied by the 

 little milk tooth, which, like that in the upper jaw, is much worn^). 



1) An incomplete skeleton of a quite youug .4ntec/ti»us which Dr. L, 

 obtaiaed at Diaraantina River in 1881, I add with doubt to this species. 



