114 
FOSSIL JAWS OF MACR0P0D1D.E, 
Examples — eleven. 
A right adult ramus (11181) with all the cheek-teeth but m. 1 — - 
A second with all the cheek-teeth older, and a third with all the 
true molars aged — A left adult ramus with the last three 
molars— Two rami with the anterior three true molars — A 
fragment of a ramus with m. 1 , m. 2 . — A young ramus with the 
last three molars, and a second with the last two — A maxilla 
with the last three molars is also referable to this species. 
The t}^pe, 11181, could in the absence of the premolar be 
mistaken without any difficulty for a mandible of H. agilis; but 
in addition to the dental differences apparent on comparing it 
critically with mandibles of //. agilis of the same age, we may 
add that the diastema is much longer, and the anterior dental 
foramen further forward than in any example of the recent 
wallaby. 
HALMATURUS VISHNU, 11. S. 
Molars with rectilinear crests, sharp angles and feeble links. 
Lower premolar unilobate, cuneiform, coarsely ribbed. Molars 
smooth. Anterior portion of lower mandibular contour straight. 
Dimensions. 
Mandibular. — The length of the full series of cheek-teeth is 
44 3; the true molars are from 334 to 35*6 in length (3); the last 
three 28-0; the last two 18'6 and 21" 9 (2); the first three 23-5; 
the first two from 15-1 to 17 4 (4); in. 2 9-0; mp. 4 , m. 1 , m. 2 174 
and 234 (2); the premolar p. 4 9-2 and 9-6 (2). The width of 
m. s is from 6 - 5 to 7*6 (8). The anterior depth is from 18'0 to 
20-0 (4); the posterior from 154 to 16-5 (4); its thickness from 
104 to 12-2 (7); its internal length 58-0. 
The length of the dental series is surpassed by that of the 
kangaroos only, and is approached most nearly by that of IT. 
agilis among the wallabies. In this latter species we find a 
maximum length of 43 -5 with a mean of scarcely 40 -0. But from 
//. agilis the extinct species is better distinguished by the length 
of the premolar, 9-2 minimum against a maximum of 84 in the 
