On a Collection of Mammals from Central and Northern Queensland. 883 



A is a half grown young, in which but the two front molars have 

 appeared, and p ^ is still in use. 



None of the specimens have a trace of a sagittal crest. Even in 

 the mature female the frontal crests extend backwards to the occi- 

 pital crest without meeting; in the younger ones they meet just at 

 the interparietal bone. 



The orbital margins are sharp, both running at first parallel, until 

 they form a distinct postorbital process, and there the margins begin 

 to converge. 



The foramina palatina are rather large, lying inside m^ and m ^; 

 and with a bony bridge behind, the height of which is as least as 

 great as the width of the foramen itself. This bony bridge is per- 

 forated by one or more small openings on each side. 



The condylus of the lower jaw is somewhat concave in its inner 

 portion, and the fossa glenoidalis therefore a little convex. 



The teeth. The dentition is normal: *f, p\, mf (28), except 

 in the fullgrown specimen (C), which in the lower jaw wants both 

 premolars (jj^) on each side, and m^ on the right side. This indi- 

 vidual has thus the following dental formula: i\, p^, vn-^h) (25). 



In the Upper jaw the incisors are comparatively small. j^ has 

 almost no trace of groove on its outer surface ; it has about the same 

 size, as each of the about equally large lobes on i^. 



Rudimentary sockets for the canines, lying outside the hinder 

 margin of the foramen incisivum. 



The premolar {p^) in the upper jaw is present in all the spe- 

 cimens , but is comparatively very small and narrow ; its mass in the 

 mature specimen is barely half as large as m \ and it has about the 

 same size as i ^. 



The molars increase in size backwards. 



In the lower jaw the molars are smaller than in the upper, which 

 is also the case with the premolars. In the fullgrown specimen the 

 premolars are shed in both the lower jaws. 



In the füll grown male, as before mentioned, several teeth are 

 shed; thus a reduction in the number of teeth appears to take place 

 in advancing years, as is the case in M. giganteus. 



The young one (A), the skull of which has a length of 99 mm, 

 is barely half grown, and is in the same condition as the young (A) 

 of Macroj^us giganteus. 



