128 FOSSIL JAAVS OF MACROPODIDA^., 



portion of the true molars. Molars smooth. Lower premolar 

 tricuspid. Palate entire. Size large. 



/Ji')]iensio7is. 



Maxillary. — Length of the cheek-teeth 70-5 (estimated), of the 

 first four 55-5 (1); of p.^ 11-0 (1). Width of m.^ 12-5 and 12-8 

 (2). 



Mandibular. — Length of the cheek-teeth 57 '0 to 62*6 (2); of 

 p.-^ 7-0, 7-2 and 8-0 (3); of p.^ m^ 18-0 (1). Width of m.-^ 9-5 

 to 10-1 (2); anterior depth 25-8 and 29*0 (3); posterior 28-0 and 

 29-0 (2). Thickness 19-7 and 21-0 (2). Liternal length 82-0. 



Form. 



Maxillary. — P.* (PL xviii. fig. 4) irregularly elongate-ovate, 

 tricuspid; the mesial cusp the shortest, cuneiform; the anterior 

 a compressed cone. The large inner portion of the posterior cusp 

 is fused with the outer; its posterior base folds l^ackwards and 

 outwards behind the base of the outer portion so that the posterior 

 surface of the tooth has a remarkable resemblance to that of the 

 molars of the kangaroos. The inner ledge is represented by a 

 low basal tubercle opposite the interval between, the anterior and 

 mesial cusp. Diameters ll'O and 4-6. 



Molars (PL XVIII. fig. 5) not distinguishable in form from those 

 of M. magister and pan. 



Mandibular.— V"" (PL xviii. tig. 3). Diameters 8-0 and 3-4. 

 Tricuspid, elongate-ovate. Crest parallel with outer side, curving 

 inv/ards posteriorly; mesial cusp the shortest, cuneiform. Crown 

 tumid on intero-posterior angle but not developing a distinct cusp. 



Molar^i (PL xviii. fig. 6) as in M. magister and 2^an- 



Lower contour line of mandible undulatory. 



Jxise and fall of teeth. 



The mandibular premolar is procumbent on the verge of the 

 diastema when the hind lobe of m.* is just showing effects (^f 



