50' 



45° - 



40° - 



35° 



50° 



CHG 17 



"1 \ \ r 



CHG 23 



SUBARCTIC 



40° 



25' 



HMS 27 



TRANSITION 



58° 



60° 

 -62° 

 64° 



SUBTROPIC 



WINTER 



J L 



I70°E 



180° 



I70°W 160° 



LONGITUDE 



150° 



140° 



Figure 6. --The 58°, 60°, 62°, 64°, and 70°F. isotherms plotted for summer, 

 winter, and fall together with the distribution of surface-caught albacore 

 in respect to the faunal zones. 



LITERATURE CITED 



BEKLEMISHEV, K. V., and G. L. SEMINA 

 1956. On the structure of the 

 biogeographical boundary between 

 the boreal and tropical regions in 

 the pelagial of the northwestern 

 Pacific Ocean. Doklady Akadennii 

 Nauk. U.S. S.R. Vol. 108, No. 6, 

 p. 1057-1060. (In Russian; trans- 

 lated by W. G. Van Campen) 



BIGELOW, HENRY B. 



1928. Plankton of the off-shore waters of 

 the Gulf of Maine. U. S. Bur. 

 Fish. , Bull. 40(2): 1-509. 



BRODSKII, K. A. 



1955. Plankton of the northwestern part of 

 the Kuroshio and the waters of the 

 Pacific adjacent to the Kurile Islands. 

 Academy of Sciences of the U.S.S.R.. 

 Trans. Inst, of Oceanology 18: 124- 

 133. (In Russian ; translated by 

 W. G. Van Campen) 



DAKIN, WILLIAM J. . and A. N. COLEFAX 



1940. The plankton of the Australian coastal 

 waters off New South Wales. Part I. 

 U. of Sydney, Dept. of Z o o 1. 

 Monogr. 1: 63-70. 



12 



