1918] 



Essenherg: Distribution of the Polynoidae 



109 



1-4 o" 



a3o'^ 



aao'^ 



^io= 



tioo 



anc.o> 



xJ^^TL. 





140° 



130' 



i20' 



no' 



aza+lan 



4C 



30 



140 



13 o 



:t:a.o^ 



iio' 



loo 



Fig. 4. Distribution of surface temperatures off the Pacific coast of Nortli 

 America in January and May. After Thorade (1909). 



