306 On the Fossil Bones of Wellington Valley 



D. 17. Fragment of the right Os innominatuni, with the 

 cotyloid cavity. 

 C D. 18. The same bone of a smaller individual of the same 

 species. 



D. 19. Central first phalange. 



D. 20. Inferior extremity of the tibia and fibula, with the 

 bones of the tarsus still adhering, belonging to i\ 

 species of Kangaroo or Halmaturus, still more dimi- 

 nutive in size than that to which the specimens 10-19 

 belong. 



D. 21. Inferior extremity of the left humerus, of a small 

 Halmaturus: it does not belong to the Wombat as 

 Mr Clift supposed. 



It is my opinion, that all the preceding specimens from No. 

 10 to 21 inclusive, excepting only No. 20, may be referred to 

 the species of Halmaturus, to which the molares No. 10 belong, 

 and which is very distinct from either of the two living species 

 of that genus. The fossil Halmaturus resembles, in many re- 

 spects, the H. Thetis already mentioned, although it differs 

 in others so as to render it impossible to suppose them to be- 

 long to the same, founded on the anatomical differences which 

 the bones present on comparison, and on their comparative pro- 

 portions. I doubt not, therefore, that the fossil lesser Halma- 

 turus will be found to differ no less from the living species than 

 most of the other remains of the New Holland cavern. 



E. Genus PHASCOLOMYS, or WOMBAT. 



Left branch of the lower jaw of a very large wombat. 



A careful comparison of this specimen with the same bone in 

 three skeletons of the living wombat, has not enabled me to 

 discover any marked difference ; the fossil, however, must have 

 belonged to an animal exceeding in size the common wombat 

 by nearly one-third. May not this arise from a specific differ- 

 ence between the fosil and the living ? which the few fragments 

 of the former we possess does not permit of our establishing on 

 more certain characters, — I mean anatomical, — than those de- 

 duced from the mere difference of size. 



C. E. 2. Fragment of the lower jaw of the wombat, with three 

 mutilated molares. 



