88 



the brownish terminal tuft, but below it continues to within 2 inches of the 

 tip This tail colouration is, on the whole, more as in hackctti than lateralis, 

 but in both there is considerable variation. The usual narrow black dorsal line 

 is continued rather more definitely on to the rump than in one of our specimens 

 of lateralis, but the difference may be due to this part being in fresh pelage, and 

 30 showing the line more distinctly. 



The outline of a skull of an adult male Isoodon 

 naiiticiis (thick lines), superimposed on an out- 

 line of /. obcsuhis (thin lines). One and three- 

 quarter times natural size. 



"Skull in size- and general shape quite as in lateralis, smaller, and with less 

 heavy supraorbital ridges than in hacketti. Palatal foramina comparatively 

 long,' about as long as in hacketti. In the bullae there is a difference between 

 lateralis and hacketti which had not been previously noticed. In the former 

 they are fairly well swollen, anteriorly as well as posteriorly, so as to produce 

 a transverse convexity (hardly to be called a ridge), in front of which the bone 

 descends nearlv vertically towards the level of the glenoid surfaces. In 

 hacketti, however, the whole bulla is larger, but lower and more spread out, 



