6i8 



PATAGONIAN EXPEDITIONS: ZOOLOGY 

 Fig. 23. 



Distribution of the bivalve family Miitelida;. 



Fig. 24. 



Distribution of the bivalve family Etheriidce. i, Mulleria ; 2, Bartlcttia ; 3, Etheria \ 4, Pseiido- 

 mulleria. 



