BY C. W. DE VIS. 
117 
small, formed by the coincidence of a rib in the middle of the 
compression on either side. Sides nearly parallel; fore end 
acuminate; intero-posterior angle a little expanded, but not bearing 
a distinct cusp. About as long as m. 1 . 
P. 3 (PI. xvii. fig. 24) diameters 74 x 3 7, otherwise differing 
little from p. 4 . 
Molars. — (PI. xvn. fig. 26). Subelongate, diameters of m. 3 112 
x 8-0. 
Maxillary. — P. 4 (PI. xvn. fig. 28) elongate, pointed anteriorly, 
diameters 10*5 x 5'0. Ledge very narrow, continued to the fore 
end of the crown; an intero-posterior cusp connected with the lobe 
apically and separated from it posteriorly by a deep vertical 
gorge, crest tridentate; outer surface of crown mesially impressed, 
the impression strongly denning an anterior cusp. Median cusp 
connected with basal rim of ledge by a vertical rib. 
Molars. — (PI. xvn. fig. 27). Subquadrate; diameters of m. 3 11-5 
x 9*5; the posterior hollow of m. 4 nearly closed in at the base 
by an elevated lip which on anterior teeth forms the adpressed 
fold. 
Rise and fall of teeth. 
Mandibular. — The permanent premolar is ejecting its predeces- 
sor just before the hind lobe of m. 3 comes into use; it is retained 
at least till the hind lobe of m. 4 is half worn down, and its per- 
sistence causes m. 1 to be thrust out of the line of the teeth or 
reduced to a mere shell. As Owen observes, this retention of the 
anterior cheek-teeth is inconsistent with the dental flux of a true 
Macropus. 
.Examples — -seventy-three. 
Mandibular. — Adults thirty-one; adolescents nineteen; young 
twenty. 
Maxiila,ry. — One adult cranium with all the cheek-teeth; two 
portions of young maxillae. 
This, the most abundant of the species with teeth similar in 
size and form to those of the type of Owen's H. cooperi, is the 
