149 



The following specimens may be provisionally referred to this species. 



43959. The proximal extremity of the left humerus ; from Darling 

 Downs. The longest transverse diameter is 0,063. 



Presented by Dr. George Bennett, 1874. 



43911. The proximal extremity of the right radius ; from a cave in 

 the Wellington Valley. 

 Presented by the Trustees of the Australian Museum, 1870. 



46073. The first phalangeal of the second digit of the right manus ; 

 from Queensland. 



Presented by Dr. George Bennett, 1874. 



40062. Cast of the distal two thirds of the right femur. The 

 original is from Queensland, and is preserved in the 

 Museum at Sydney. It has the prominent inner ridge on 

 the tibial trochlea characteristic of P. platyrhinus and 

 P. latifrons. 



the Trustees of the Australian Museum, 1870. 



38781. The distal portion of a similar left femur; from Darling 

 Downs. Presented by F. N. Isaac, Esq., 1861. 



43924. Two first phalangeals; from the caves of the Wellington 

 Valley. 

 Presented by the Trustees of the Australian Museum, 1870. 



Phascolomys medius, Owen '. 



This species is intermediate in size between the preceding and 

 following ones, with which it agrees in the structure of the molars 

 and palate ; the concavity of the latter being rather less than in 

 P. magnus, but greater than in P. latifrons. The length of the 

 space occupied by the first three upper cheek-teeth is 0,038, against 

 0,0255 in P. latifrons and 0,055 in P. magnus ; and that of the 

 upper diastema 0,063 against 0,044 in the existing species. The 

 inferior border of the mandible is strongly convex, the section of 

 pm . 4 quadrangular, and the masseteric fossa of the mandible 

 shallow. 



Hal. Queensland and New South Wales. The following speci- 

 mens include the types. 



1 Phil. Trans. 1872, p. 241. 



