BY C. W. DE VIS. 113 



Crown mesially compressed, with a distinct mesial rib on each 

 side. Basal rim on each side tumid, subnodular, especially on 

 outer side, obscurely continuous round fore end. 



Molars. — (PL xvii. fig. 20). Links high but narrow; on the outer 

 side of the posterior base of m. ^ a rudimentary ledge-like talon. 



Sufficiently distinguished by the premolars from all other species 

 recent and extinct. 



Halmaturus SIVA, n.s. 



Molars with curved crests, rounded angles and strong links. 



Lower premolar unilobate, narrow; intero- posterior dilatation 

 moderate, consisting apparently of two flat folds tapering off 

 above into vertical ribs; anterior cusp small and ill-defined. 



Molars smooth, with long anterior talons, and without posterior 

 groove or basal talon. The inner valley of the anterior talon 

 subdivided by an accessory link in the two anterior molars. 



Dimetisions. 



Mandibular. ~T\\Q full set of adult cheek-teeth is 40'6 in 

 length; the first three molars 24-4 and 24*9; the last three 28*8; 

 the first two 17*2; the premolar 7*1. The width of m.'^ is from 

 6*2 to 6 -4 (4). The anterior depth of the mandible is from 18-0 

 to 23-0 (4); the posterior from 12-9 to 18-1 (4); the thickness 

 from 11-3 to 12-0 (3). 



In general size it agrees with the larger wallabies of the 

 present day. 



Form. 



P.* (PL XVII. fig. 21) diameters 7*1 x 2-7; crest over inner edge 

 anteriorl}'', nearly level, curving inwards posteriorly; anterior 

 cusp scarcely differentiated from the^ rest of the crown ])y a slight 

 mesial impression on the inner side; posterior to this the inner 

 side is rendered more concave by two successive folds ending 

 above in sharp plaits. 



Molars. — -(PL xvii. figs. 22-23). The anterior talons are in 

 length nearly a third that of the entire tooth. 



