4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



Little information is available on the depth distribution of C. 

 challengeri in Subarctic Water. Birstein and Vinogradov (1955, fig. 

 32) show it ranging from near the surface down to 500-2000 m and 

 possibly deeper. Bogorov (1958) refers to it as a surface zone (0-200 

 m) species. In CalCOFI Cruises 5 and 9, which sampled the upper 



Figure 2. — Distribution records of Cyphocaris challengeri in the Puget Sound region. 



70 m with 1-m plankton nets, C. challengeri was taken mainly at night. 

 Five of the six positive stations of Cruise 5 (July 1949) were night 

 stations; an average number of 16/1000 m^ was taken at the night 

 stations, and 1/1000 m^ at the day station. Of the 13 positive stations 

 on Cruise 9 (November 1949), 12, with an average catch of 12/1000 m^ 

 were night stations, whereas only 1/1000 m^ was caught at the day 

 station. There is clearly an upward movement of the population 

 at night. • 



