104 
FOSSIL JAWS OF M ACROPODID^E, 
Rise and fall oj teeth. 
The permanent premolar has risen to the crowns of its prede- 
cessors as the fore lobe of m. 4 has pierced the gum, the hind lobe 
of m. 3 , having then its edge bevelled off by wear; but it may be 
also fully in place and distinctly worn at an earlier period, in 
which the hind lobe of m. :3 is almost untouched by wear. It 
remains in function at least till the last molar is well worn down. 
Examples — nine. 
Mandibular. — An adolescent right ramus with the first four 
cheek-teeth — An aged left ramus with base of incisor and the 
posterior true molars — An adult right ramus with all the true 
molars, m. 1 worn to the base — An adult right ramus with the 
last three molars in fine preservation — An adolescent right ramus 
with the last two molars well preserved — A right adolescent 
ramus with the first three true molars and p. 4 exposed from above 
in its crypt, and fragments of a right adolescent ramus with the 
first three cheek-teeth. 
The species is well characterised by the form of its premolar in 
conjunction with a size superior to that of modern wallabies. 
Halmaturus anak, Owen, VI. Vol. xv. p. 185, 1859 
Protemnodon anak, Owen, partim, I. 1874, p. 275. 
P. og, Owen, I. 1874, p. 377. 
P. rcechus, Owen, I. 1874, p. 281. 
P. mimas, Owen, I. 1874, p. 278. 
P. antcevs, Owen, I. II. p. 448. 
Sthenurus atlas, Owen, partim, I. 1874, p. 265. 
S. brehus, Owen, I. 1874, p. 272. 
Macropus mimas, Flower, IX. pt. 2, p. 720. 
M. brehus, Lydekker, IV- p. 207. 
M. rcechus, Owen, I. 1874, p. 281; Lydekker, IV. p. 212. 
M. anak, Lydekker, IV. 214. 
