116 FOSSIL JAWS OF MACROPODID^F., 



all the true molars; nine with sundry molars, and two young 

 rami with mp.^, m. ^, m.-. 



Halmaturus cooperi, Ow. 



Molars with curved crests, rounded angles and strong links. 



Lower jDremolars elongate, narrow, tumid on intero-posterior 

 angle, but developing there no cusp; crest tridentate. Molars 

 smooth without groove or basal talon posteriorly. Upper pre- 

 molar ledged, with an intero-posterior cusp; molars smooth with 

 adpressed folds posteriorly. Lower mandibular contour undula- 

 tory. Palate entire. 



Dimensions, 



Mandibular. — The full series of cheek-teeth measures in adults 

 from 38-6 to 42-5 (3); in adolescents from 44-4 to 507 (3). The 

 true molars vary from 34*0 to 39*5 (5); m. ^, m."^, m.'^ from 28-5 

 to 336 (9), but in an adolescent tooth reach 35*7; m. ^, m.* are 

 from 20-5 to 25 (T); m ^ from 11-8 to 12 8 (4). The tlrst four 

 cheek-teeth range [from 29-3 to 37*0 (15); the first three from 

 29-3 to 38-4 (4). The premolar varies from 7-0 to 9-6 (6). The 

 width of m.'^ ranges from 6*5 to 8 5, doubtfully to 9-6 (54). The 

 anterior dej^th in adults is from 17-5 to 27*3 (17); in adolescents 

 17 6 to 23-5 (17); the posterior in adults from 17*4 to 266 (18); 

 in adolescents from 15-0 to 21-5 (6). The external length is from 

 65-7 to 78-0 in adults (3). The internal from 532 to 66-7 (6); 

 the thickness from 11*4 to 16 "2 (23). In the young the first 

 three cheek-teeth are 23-1 and 24-0 (2); mp.^, m.^ 16-0; m.^ 9-9; 

 m.i,m.Sm.» 26-6 and 295; m.\m.2 from 17-0 to 21-6 (4); m.-, 

 m.3 from 20-0 to 22-8 (5); m.^ from lO'l to 12-5 (4); p.^ 6-8 and 

 7-7 (2). 



Maxillary. — The entire set of cheek-teeth is 50-2; m.^, m - 

 23-0; m.", m.^ 23-3; and p.* 10-5. Width of m.'' 9-5. 



Form. 



Mandibular. — P.* (PL xvii. fig. 25) irregularly ovate, diameters 

 8-5 X 3-1; crest subcentral, tridentate. Crown mesially com- 

 pressed; the compression defining an anterior cusp. Mesial cusp 



