AMPHIPOD GENUS PARATHEMISTO BOWMAN 



351 



Figure 4. — Parathemislo pacifica Stebbing, distribution in March 1949, CCOFI cruise 1. 



ured with an Atlas-type current meter fastened in the center of the 

 mouth of the net. This measure has been used to correct the counts 

 of the numbers of amphipods in the samples studied to numbers per 

 1 ,000 cubic m. of water. 



In the CCOFI area P. pacifica is by far the most abundant amphi- 

 pod. The southern extent of its range lies within the CCOFI area, 

 and by comparing the southern boundaries with the superimposed 

 isotherms at a depth of 30 m., it is possible to estimate the limiting 

 temperatures. In cruise 1 this temperature is estimated to be about 



