NO. 358S PELAGIC AMPHIPOD — BOWMAN AND McCAIN 3 



Cyphocaris occurred north of Cape Mendocino, Calif, (about 40.3°N). 

 Likewise, Brown Bear Cruise 199 occupied stations south to about 

 32°N, or just south of the latitude of San Diego, but collected very- 

 few Cyphocaris south of 38°N, the approximate latitude of San 

 Francisco. 



Figure 1. — Offshore distribution records of Cyphocaris challengeri In the northeastern 



Pacific. 



The southern boundary of C. challengeri in the northeastern Pacific 

 is comparable to that of other subarctic plankters: the euphausiids 

 Thysanoessa longipes and Tessarabrachion oculatus (Brinton, 1962), 

 and the chaetognath Sagitta elegans (Bieri, 1959). West of 150°W the 

 southern boundary is not known, but presumably, as in other sub- 

 arctic plankters, it runs parallel to and somewhat north of the North 

 Pacific Drift. In the northwestern Pacific Bogorov (1958) lists C. 

 challengeri as a characteristic species of the boreal plankton, the 

 southern boundary of which approxuuates the convergence of the 

 Oyashio and Kuroshio systems. 



