88 FOSSIL JAWS OF MACROPODIDj:, 



m.^ — A right ramus, teeth destroyed; vascular foramen — Part of 

 a left ramus, teeth destroyed —Isolated tooth, mp.* — Isolated 

 tooth, m." — Isolated tooth, m.* — A second example, hinder 

 portion of a left ramus, with m.'^, m,^; 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 (/.c. 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 symphj^sis 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 generally alcove 

 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 Sthenurics it has been observed in but two 

 instances, in one Macropus and in one Halmaturus. 



