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 l^earing 

 a distinct cusp. About as long as m. ^ . 



P.-^ (PI. XVII. fig. 24) diameters 7'4 x 3 7, otherwise differing 

 little from p. ^ . 



Molars. — (PL xvii, fig. 26). Subelongate, diameters of m.-"^ 112 

 X 8-0. 



Maxillary. — P.^ (PI. xvii. 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 defining an anterior cusp. Median cusp 

 connected with basal rim of ledge by a vertical rib. 



Molars. — (PL xvii. fig. 27). Subquadrate; diameters of m.^ 11*5 

 X 9*5; the posterior hollow of m.'*= 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."^ comes into use; it is retained 

 at least till the hind lobe of m."*^ is half worn down, and its per- 

 sistence causes m. ^ 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 . 



Examjjles — seventy-three. 



Mandibular. — Adults thirty-one; adolescents nineteen; young- 

 twenty. 



Maxi la.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 



