PHASCOLOMYIDJK. 157 



6, 7 ; and iu the ' Extinct Mammals of Australia,' pi. liii. 

 figs. 6, 7. Purchased, 1857. 



32911 x. Fragment of the left ramus of the mandible, showing the 

 last three true molars ; from the Condamine River. 

 Noticed by Owen in the ' Phil. Trans.' 1872, p. 194. 



Purchased, 1857. 



43303 x. Fragment of the right ramus of the mandible, showing 



(Fig.} the last three true molars ; from a cavern in the Wellington 



Valley, New South Wales. Figured by Owen in the ' Phil. 



Trans.' 1872, pi. xxxviii. figs. 5, 6, and in the 'Extinct, 



Mammals of Australia,' pi. Lxiii. figs. 5, 6. 



Purchased. About 1852. 



Genus PHASCOLONUS, Owen \ 

 Syn. (?) Sceparnodon, Owen ' 2 (ex Ramsay, MS.). 



There is every probability that the upper incisors on which Sceparn- 

 odon is founded belong to P. gig as, and it is on this provisional 

 reference that the latter is generically separated from Phascolomys. 



The upper incisors are wider than the lower, are much compressed 

 antero-posteriorly, have a bevelled cutting-edge, a concave posterior 

 surface, and their enameHed surface directed anteriorly ; in the 

 lower incisors the biting-surface is much elongated. 



The action of the upper upon the lower incisors must have been 

 analogous to that obtaining in Diprotodon. 



Phascolonus gigas, Owen 3 . 

 Syn. Phascolomys gigas, Owen 4 . 



(?) Sceparnodon ramsayi, Owen '. 



This is the type and only known species ; it was apparently about 

 equal in size to a Tapir, but of much stouter build. The inferior 

 border of the mandible has the great convexity characteristic of the 

 Latifront group of PJiascolomys, but the masseteric fossa is deeper, 

 and has a prominent inferior ridge ; pm. 4 has the ellipsoidal section 

 of the Platyrhine group, and pm- 4 the complexity characteristic of 

 the latter ; in the partially compressed upper incisors P. platyrhinus 



1 Phil. Trans. 1872, p. 257 (as a subgenus). 



* Ibid. 1884, p. 245. 



3 ' Encylopsedia Britannica,' 8th ed. vol. xvii. p. 175 (1859). Phascolomys, 



* Loc. cit. 



5 Phil. Trans. 1884, p. 247. 



