298 



DE. G. H. rOWLEE — BISCAYAN PLANKTON : 



In that zone there would be a happy hunting-ground, a region of maximum food- 

 supply, for the purely mesoplanktonic species. Taking the species, and the oldest 

 stages of species, which were recognised above as having been purely mesoplanktonic 

 during the Biscayan cruise *, we find tliat 



oms. 



This fits in well with the foregoing suggestion. These mesoplanktonic species, though 

 few in actual numbers, of course help to swell the total averages in the table (p. 297) 

 and diagram (fig. K) ; but if they are taken out, the result is only to put the 

 point of greatest mesoplanktonic intensity of epiplanktonic species a little higher (about 

 400 fathoms). The whole question seems worthy of attention for future expeditions. 







50 



100 



200100 



J50-I50 



300-200 



400-300 



Distribution in averages of all Ostracods at all depths (comparable hauls). 



Explanation of Plate 27. 



The upper part of this Plate represents diagrammatically the observed distribution of 

 the different species captured. 



* Omitting scarce forms as too few to be significant. 



