254 LLOYD'S NATURAL HISTORY. 
Protemnodon anak (in parte), Owen, Phil. Trans., 1874, p. { 
275. 
Sthenurus atlas, Owen, Phil. Trans., 1874, p. 264; Lydekker, | 
Cat. Foss. Mamm. Brit. Mus., pt. v., p. 232 (1887). 
Characters.—T his genus and species, while agreeing with Pro- | 
coptodon in the characters of the last premolar tooth, differs in | 
having by the two branches of the lower jaw united only by liga- 1 
ment, and in the spatulate form of the lower incisor teeth, which 
resemble those of A/acropus, and probably had a similar scissor- | 
like action against one another. The molar teeth are devoid. 
of vertical foldings of the enamel, and are very short and wide; 
the longitudinal bridge connecting their two transverse ridges 
being very imperfect, and the anterior basal ledge of the upper 
molars being unconnected by such a bridge with the first trans- 
verse ridge. In size the species was large, the skull being 
probably about a foot in length. 
This genus forms a connecting link between the existing 
Macropus and the extinct Procoptodon. 
Distribution—Queensland and New South Wales. 
GENUS MACROPUS (sura, p. 14). 
I. MACROPUS TITAN. 
Macropus titan, Owen, in Mitchell’s Australia, vol. 11, p. 360 
(1838) ; Lydekker, Cat. Foss. Mamm, Brit. Mus., pt. v., p 
225 (1887). 
Characters.— Resembling the existing AZacropus giganteus (to 
which it is in all respects closely allied) in the extremely small 
size of the last premolar tooth. This species is distinguished by 
its superior dimensions, and by the very general occurreace of 
ene or more vertical grooves on the hinder aspect of the lower 
