BY C. W. DE VIS. 115 



living species; by the greater width of the molars, that of m. ■' 

 averaging 7 1 against 6 --I in //. agilis; by its much feebler inter- 

 lobular links; and by the straightness of the lower edge of the 

 mandible. The same characters serve to separate it from //. 

 ualabatii)<, which approaches it somewhat more nearly in the 

 length of the premolar, but recedes further from it in the total 

 length of the cheek-teeth. With no other recent species is it 

 comparable as to the dimensions of teeth, though in the depth 

 and thickness of the mandible it is occasionally exceeded by all 

 the larger-sized modern wallabies. 



Forin. 



Mandibufar. — P. ^ (PL xvii. fig. 3) subelongate, oblong, cuneiform, 

 diameters 96 x 4'4, sides parallel, fore end obtusely pointed. 

 Crest a little to the inner side, with obtuse denticulations corres- 

 ponding to coarse but indistinct corrugations on either side of the 

 mesially compressed crown. A faintly marked nodular basal rim 

 on either side is continuous round the fore end. In a second 

 example with diameters 9*2 x 4 6 the mesial compression of the 

 crown is stronger, and the crest curves slightly over to the intero- 

 posterior angle, rendering the inner side of that end of the crown 

 subconchoidal. Length equal to or rather less than that of m>. 



Mandible elongate, shallow, nearly straight from the posterior 

 molar forward. 



Molars (PI. xvii. fig. 4) without accessory folds; with or without 

 a rudimentary talon; links narrow and low. 



Persistence of teeth. 



The permanent premolar though much worn is still in the 

 horizontal line of the molars, and shows no sign of ejection when 

 the last molar has been some time in use; in another instance the 

 roots of the broken tooth are in place, though m. ^ is much worn. 



Examples — sixteen. 



These consist of two adult mandibular rami with all the cheek- 

 teeth, the premolar of one of them being imperfect; of three with 



