MOLLUSCA. 



I5i 



It would seem from this table that the species was a member of the lower epiplaukton, 

 aod as it was taken also in three hauls with a closing-net out of seven such hauls 

 wliicli contained Mollusca, and as it was not so plentiful above as to fill the mid- water 

 with dead specimens, it is very probable that it ranges also into the mesoplankton, as 

 low as the zone of 1000-750 fathoms. 



Clio pyramidata, Brown. 



At 



This species, like the preceding, appeared to belong to the lower epiplankton, but 

 with an optimal horizon of 50 fathoms. It is possible that it extends below the 

 hundred-fathom horizon, having twice been taken in a closing-net. 



Cavolinia inflexa, Lesueur. 



At 



91 



o —i 



.:: c3 

 o 



<D 2 



bD-~ 



si u 



> 



Unlike the last, this species was captured at the actual surface, and seemed to show 

 an optimal zone of 75-50 fathoms. The single capture at 1500-1250 fathoms, in 

 the absence of any intermediate captures higher in the mesoplankton, can hardlv be 

 taken to indicate any extension into the mesoplankton. 



