Bull. CJ. S. B. !•'.. 1924. i Doc. 968.) 



Fig 1-' —A mnnntonous plankton of Calanus finmarchicut, Massachusetts Bay, July 19, 1916, haul from 

 30-0 meters (station 10341). In connection with Figure 13 it illustrates a striking example "f vertical 

 stratification, with Calanus dominating the shoaler and Saaitta elegam the deeper levels. X 1.75 



FIG 13 Plankton dominated by Sagitla degam, Massachusetts Hay. July 19, 1916, haul fr SO meti 



1 1. >i i 10341) In connection with Figure 12 it illustrates local abundance "f tins chaetognatb at the deepei 

 levels at a station where the plankton at shoaler levels was almost pure Calanus. X 1.75 



