foor 



75- 



50- 



25- 



AUSTR A LI AN 



mmwj^m^':^^ 



INDO - PACIFIC 



END 



E M I C 



H2 HI CP CO NM NH WM WW O 



Fig. 3.— Percentage composition of successive Pliocene and Pleistocene Molluscan Faunas 



313 



