180 PEOFESSOE OWEN ON THE FOSSIL MAMMALS OE AUSTEALIA. 



differs from Phascolomys latifrons (Woodcut, fig. 8, h), in which the postpalatal apertures 

 extend forward beyond, or at least as far as, the interval between the last and penulti- 

 mate sockets*. In the more advanced portion of the roof of the mouth I noticed (in 

 1845) a characterf in Phascolomys latifrons by which it differed from Phase, vombatus, 

 and as I now know it also differs from Phase, platyrhinus. The portion of bony palate 



c 



r.ilatal surface of upper jaw and teeth. 

 J'h(i.uolomys jilfiii/rhinns : uat. size. 



between the molary series and the incisors is more concave transversely, or deeper, in 

 I'/iasrolomys lafifrom (Woodcut, fig. 8, n , ar, 2i, 22), and the channel is bounded by well- 

 defined or sharp borders : this character is much better marked in the fossil (Plate XVII. 

 fig. 5, 2)', 21', aa, 22) than in the skulls of Phascolomys vombafiis or Phase. i}laiyrhmus. 

 Another character in wliich the fossil resembles Phascolomys latifrons more than it 



III flie latter variety (fig. 8) the apertures pliould extend more forward tlian is represented, 

 t TraiiH. Zool. Soc. vol. ii. plate Ixxi. fig, 1. " The palatal surfaee of the intermaxilluries is deeper" (p. ;304). 



