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PROCEEDINGS OF THE NATIONAL MUSEUM 



Figure 5. — Parathemisto pacifica Stebbing, distribution in July 1949, CCOFI cruise 5. 



15° C, and for cruises 5 and 9 about 17°. The data of cruise 20 are 

 very limited, but here the 18° isotherm may be limiting. 



The numbers found at the different stations of a cruise vary con- 

 siderably. Near the southern limits the numbers decrease somewhat, 

 but elsewhere the variation appears to be random and not related to 

 available measurements of oceanographic conditions. An unsuccess- 

 ful attempt was made to determine the causes behind this variation 

 in numbers in cruise 5. Using the northern four lines of stations in 

 order to eliminate the limiting effect of higher temperatures to the 



