88 
FOSSIL JAWS OF MACROPODID.E, 
m. 1 — A right ramus, teeth destroyed; vascular foramen — Part of 
a left ramus, teeth destroyed — Isolated tooth, mp. 4 — Isolated 
tooth, m. 2 — Isolated tooth, m. 4 — A second example, hinder 
portion of a left ramus, with m. ;3 , m, 4 ; aged. 
Sthenurus, Owen. 
Sthenurus, Owen, I. 1874, p. 264; Lydekker, IV. p. 231. 
Protemnodon, Owen, partim — Owen, I. 1874, p. 274. 
Procoptodon, Owen, — Owen, I. 1874, p. 788; Lydekker, IV. p. 
233. 
An amalgamation of Procoptodon with Sthenurus is demanded 
by their verisimilitude of tooth sculpture, and by the occurrence 
of forms of transition between the two. Owen's reference of the 
maxilla of Protemnodon anak to S. atlas has been accounted for 
by Mr. Lydekker (I.e. p. 231). 
Lower permanent premolar with an obliquely disrupted lobe 
forming the posterior moiety of the outer side, the cleft occupied 
by sinuous and papillary folds. Upper permanent premolar with 
a broad ledge on the inner side, its cavity traversed by erect 
folds. Molars short, with ascending tapering, spreading folds 
incumbent on their surfaces; posterior basal margins tumid but 
rarely forming distinct talons, mandibular symphysis generally 
anchylosed; lower incisors generally small, laterally compressed 
and much less incumbent than in other Macropods. A vascular 
foramen on the outer side of the mandible beneath one of the 
posterior molars. Posterior orifice of dental canal generalty above 
the level of the teeth. Palate with large vacuities. 
The vascular orifice is in S. goliah frequently minute, penetrating 
the bone at the end of a delicate superficial groove; occasionally 
in this species it appears to be obsolete. Outside the genera 
Palorchestes and Sthenurus it has been observed in but two 
instances, in one Macropus and in one Halmaturus. 
