114 FOSSIL JAWS OF MACROPODIDM, 



Examples — eleven. 



A right adult ramus (11181) with all the cheek-teeth but m.^ — 

 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.^, m. -. — A young ramus with the 

 last three molars, and a second with the last two — A maxilla 

 wdth the last three molars is also referable to this species. 



The tyj)e, 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, n.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. 



Mandihnlar. — The length of the full series of cheek-teeth is 

 443; the true molars are from 33-4 to 35-6 in length (3); the last 

 three 280; the last two 18-6 and 21-9 (2); the first three 23-5; 

 the first two from 15*1 to 17-4 (4); m." 9'0; mp.-^, m.^, m.^ 17-4 

 and 23-4 (2); the premolar p.'^ 9-2 and 9-6 (2). The width of 

 m.'^ is from 6*5 to 7*6 (8). The anterior depth is from 180 to 

 20-0 (4); the posterior from 15*4 to 16-5 (4); its thickness from 

 10-1 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 II. 

 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 8-1 in the 



