152 MARSTJPIALIA. 



42602. The anterior portion of the mandible, showing the bases of 

 {Fig.) the incisors and the first three cheek-teeth ; from a cavern 



in the Wellington Yalley. Figured by Owen in the ' Phil. 



Trans/ 1872, pi. xx. fig. 7, and pi. xxiii. fig. 4 ; and in the 



' Extinct Mammals of Australia,' pi. lii. fig. 7, and pi. ivi. 



fig. 4. 



Presented by the Trustees of the Australian Museum, 1870. 



42610. Fragment of the left ramus of the mandible, showing two 

 (Fig.) true molars ; from the Wellington Yalley. Figured by 



Owen in the ' Phil. Trans.' 1872, pi. xix. fig. 3, pi. xxii. 



fig. 6, and pi. xxiii. fig. 5, and in the ' Extinct Mammals 



of Australia,' pi. liii. fig. 3. 



Presented hy the Trustees of the Australian Museum, 1870. 



B. Serial position uncertain. 

 Phascolomys curvirostris, Owen\ 



This species, which was apparently somewhat larger than P. 

 medius, is known only by the type specimen. It is characterized by 

 the great downward deflection of the palatal border of the premaxillse. 

 The enamelled surface of the upper incisor is mainly directed 

 anteriorly, in which respect it agrees with the Latifront group. 



Hah. New South Wales. 



M. 2576. Cast of the premaxillse and incisors. The original, which 

 is the type, was obtained from a cavern in the Wellington 

 Yalley, New South Wales, and is preserved in the Austra- 

 lian Museum, Sydney ; it is described and figured by 

 Owen in the ' Quart. Journ. Geol. Soc' vol. xlii. p. 1, pi. i. 

 Presented hy Sir B. Owen, K.C.B., 1886. 



C. Platyrhine Group. 



The two existing members (P. platyrhinus and P. wombat) of this 

 group have the fronto-nasal suture convex posteriorly ; the nasals 

 wide ; pm. 4 small ; a tubercle on the lachrymal ; the enamelled 

 surface of the upper incisors directed mainly outwards, the inferior 

 border of the mandible slightly convex ; the masseteric fossa deep ; 

 and pm. 4 ellipsoidal in section. 



Phascolomys mitchelli, Owen ^ 

 This species is very close to P. platyrhinus, with which it is 



1 Quart. Journ. Geol. Soc. vol. xlii. p. 1 (188G). 



'^ In Mitchell's 'Three Expeditions into Eastern Australia,' 2nd ed. vol. ii. 

 p. 362 (1838). 



