174 



to submit, as follows ; whilst as regards the Gastropod-fauna, the 

 •comparisons are not completed — the magnitude of the task being 

 disproportionately great, though estimated by so much as has 

 been determined, there are fewer species represented in living 

 •creation or in older Tertiary deposits, and a larger number pecu- 

 liar to the fauna. 



Table of the Defined Species of Lamellibranchiata, occurring 

 in the Pliocene Sands, showing their Distribution in Time 

 within the Australian Area. 



The sign xx before the name indicates that the species is abun- 

 bant ; x that it is not uncommon. The asterisks in the columns 

 showing distribution indicate that the species are characteristic. 



Eocene. Miocene. Pleistocene. 

 Humphreyia Strangei, ^cZa.7?2-5 .... 

 X Saxicava aretica, i//??«. ... ... x X 



Corbula ephamilla, 2'ate * x 



Myodora brevis, Sow. ... . . . x x 



Mactra Hamiltonensis, Tate * 



Recent. 

 X 

 X 



