872 ROBERT COLLETT, 



The skull. 



A B 



Length of skull 77 mm — 86 mm 



Breadth 31,5 „ — 38 „ 



Interorbital space 11 „ — 12 „ 



Greatest height (above bullae) . . . 25,5 „ — 29,5 „ 

 From tip of snout to bind margin of 



frontalia 56 „ — 63 „ 



Length of nasalia 26,5 „ — 32 „ 



Length of dental series in the upper jaw 41 „ — 45 „ 

 Length of dental series in the lower jaw 38 „ — 41 „ 



Length of lower jaw 51 „ — 63 „ 



The interorbital space is strongly contracted across the centre of 

 the forehead, and is in A a little more, in B a little less than | of 

 the breadth of the skull across the zygomatic arches. 



The frontalia form posteriorly a sagittal crest, which in B extends 

 along the sutura sagittalis very strongly developed and high, but is 

 lower in A (and only slightly visible in a third skull of almost the 

 same size as A, sent from the Museum at Brisbane). 



The posterior margin of the frontalia forms in the sutura coronalis 

 an almost straight line. 



The lacrymalia are comparatively small; the height is equal to 

 the base of the two last premolars. 



The zygomatic arch is distinct; its height in the middle is al- 

 most equal to the base of the 1*' molar. 



The bullae osseae are particularly large, elevated and bluntly poin- 

 ted; the length of the base is about equal to that of the 3 last molars. 

 The foramina incisiva and foramina palatina are about equal in 

 length; the latter are broadly ovate, and extend between the 2 first 

 molars. In neither of the two specimens is there a trace of foramina 

 in the pars palatina of the upper jaw. 

 The teeth. 

 The dentition is normal in both: 



^h c h P h 'n^i (48). 

 In the upper jaw the central incisors are very small, and separated 

 by a distinct space; i ^, which has the form of a little premolar, has 

 a pointed central cusp and smaller side cusps, and is separated by 

 an inconsiderable space from the premolars. The canine teeth in the 

 old male specimen (B) are very long and have a broad root , whilst 

 in the female they are scarcely longer than the nearest premolar. Of 



