292 Proceedings of the Royal Society of Victoria. 



VII. — Summary of Conclusions. 



From the foregoing examination of our Tertiary fish remains 

 the following principal points may be summarized : — 



The genus Asteracanthus previously recorded by Tate from the 

 Balcombian and Kalimnan, under the generic name of Stropho- 

 dus, undoubtedly belongs to the former genus, evidence being 

 rendered by the microscopic structure of the teeth. This extends 

 beyond question the range of this hitherto Jurassic and Upper 

 Cretaceous fish into the Tertiary seas round Southern Australia. 



With regard to the identified species, two Upper Cretaceous 

 species occur in our beds of Jan Jukian age, viz. — 



Carcharias acutus and Ijamna bronni. 



One species — ^Oxyrhina minuta — is apparently a comparatively 

 restricted Miocene form in the Northern Hemisphere, and occurs 

 here in the Jan Jukian, Balcombian, and Kalimnan. Ten species 

 have a comparatively wide geological range in the tertiaries, both 

 in the Southern and Northern Hemispheres, namely : — S. prisca, 

 0. contortidens, O. cuspidata, L. crassidens, L. compressa, Ox. 

 hastalis. Ox. desori. Ox. retroflexa, C. auriculatus, and 0. 

 megalodon. 



These data do not furnish any very clear evidence of our 

 tertiary succession and relative age of the beds, since the fauna 

 has a general tertiary aspect, but the occurrence of the few 

 Mesozoic forms gives an aspect of antiquity to the older portion 

 of our tertiary strata. 



With regard to the occurrence of certain species found both in 

 New Zealand and Australian strata, we gather some interesting 

 information, which points to some affinity with the Cretaceo- 

 Tertiary Group of the former area. 



New Zealand. Australia. 



