BY R. ETHERIDGE, JUN. 409 



a comparison between the latter and 7. Australis, from the fact 

 that the casts in the Australian Museum do not exhibit the teeth. 



The upper surface of the pre-maxillary, judging from the section 

 of the right one, would 'form rather a narrow arch, differing very 

 much in this respect from the broad semi-circular outline of 

 /. campylodon. 



In describing the Fossil Reptilia of New Zealand, Sir James 

 Hector, F.R.S., has applied the name of Ichthyosaurus Australis* 

 to some remains found in that country. Prof. McCoy's name 

 having priority, that of the New Zealand species will need altera- 

 tion. 



Locality and Horizon. — Marathon Station, North-Central 

 Queensland; "Rolling Downs Formation'' (C. de Vis, Esq.). 



EXPLANATION OF PLATE. 



Fig. L A general view of the snout of Ichthyosaurus Marathonemis. 



Fig. 2. One of the teeth ( x 2), 



Fig. 3. Transverse section of the posterior end (nat. size). 



* Trans. N. Zealand Inst, for 1873 [1874], p. 355. 



