122 
FOSSIL JAWS OF MACROPODID^E, 
Molars smooth, elongate, with curvilinear crests, thick lobes, 
rounded angles and strong, directly longitudinal links. Base of 
re volute inner edge of hinder surface of upper molars elevated, 
forming an adpressed fold on the corresponding part of the 
anterior teeth; a vertical groove on the hinder surface of the 
lower molars. Upper premolar bilobate, with a small intero- 
posterior cusp; lower premolar bilobate, with a large intero- 
posterior cusp nearly confluent with the hinder lobe. 
Dimensions. 
Mandibular. — Adults : The entire series of cheek-teeth is 56*6 
and 60-8 in length (2); the premolar from 6-4 to 7*6 (3). The 
series of true molars from 51*8 to 59*3 (8); the last three from 
40-0 to 50-5 (33); the last two from 28-1 to 36-5 (39); m. 4 from 
16- 2 to 20-0 (26); the first three 35-7 and 38-5 (2); m. 2 ,m. 3 from 
26-1 to 28-5 (3); m. 2 from 13-7 to 16-7 (5); m. 3 from 16-1 to 
17- 6 (8); m. 1 15-4 (1). The width of m>4s from 9-0 to 11-6 (91). 
The anterior depth of the mandible is from 29*6 to 44*0 (60); the 
posterior from 26*6 to 41 (75); the thickness from 15-6 to 24-0 
(76). The external length varies from 127-0 to 142-0 (6); the- 
internal from 80-0 to 98-0 (20); the diastema from 61-0 to 70-0 
(5); the symphysis from 56 -0 to 69-0 (5). 
Adolescents : The first four cheek-teeth are 53*0 (1); the series 
of true molars 60-0 (1); the first three molars from 40*2 to 48-4 
(7); the first two 27-3 (1); m. 2 is 15-6 (1); m. 4 16-2 and 19-0 (2); 
m. 2 , m.; 3 from 27"5 to 34-0 (11); m. :3 from 16-0 to 17*4 (8); m. 3 , 
m. 4 from 29-0 to 35-0 (5); the premolar from 7-2 to 8-6 (3). The 
width of m. 3 is from 9-1 to 11-3 (33). 
Young: P. 3 , mp. 4 , m. 1 measure from 29*9 to 32*5 (7); mp. 4 , 
m. 1 , m. 2 from 35*2 to 43-5 (7); mp. 4 , m. 1 , m. 2 , m. 3 from 45*0 to 
50-0 (4); mp. 4 , m. 1 from 22-1 to 29-1 (15); m. 2 , m. 3 from 28-0 to 
31-5 (4); p. 3 , mp. 4 from 18-9 to 19-6 (6); mp. 4 from 10-5 to 11-0 
(3); m. 1 from 10-5 to 13-2 (8); m. 2 from 13-6 to 14-4 (3); m. 3 
from 15-5 to 16-0 (3); the premolar p. 3 from 7-1 to 9-0 (16). 
Maxillary. — Adults : The full extent of the cheek-teeth is from 
62-5 to 65.7 (4); of the true molars from 54-0 to 60-6 (12); of the 
