Bull. U. S. B. F., 1924. (Doc. 968.) 
Fig. 23. — Plankton at the surface, northern channel, April 15, 1920 (station 20105), dominated by the 
copepods Calanus finmarchicus, Acartia, and Metridia. In connection with Figure 24 it illustrates 
vertical stratification of the plankton. X 10 
Fig. 24. — Plankton of the deeper levels, at the same station as the surface haul in Figure 23. This deep haul 
(150-0 meters) was dominated by the “nauplius” larvae of barnacles (Balanus), with fewer Calanus 
and other copepods. X 10 
