Table 11. --Percentage composition and average number of organisms per 1,000 m. of water 

 strained by the lower net on the Smith cruises 



Item 



Cruise 



HMS-32 



HMS-34 



HMS-35 



Cruise period (1956) 



Number of samples 



Number of day hauls 



Number of night hauls 



Number of twilight hauls 



Avg. sample vol. (cc./ 1,000 m.-') 



Feb 



23 



13 



9 



1 



5 







May 



31 



18 



9 



4 

 4.9 



Aug. 

 33 

 20 

 11 



2 



6.2 



Foraminif era 



Radiolaria 



Siphonophora 



Chaetognatha 



Polychaeta 



Copepoda 



Os tracoda 



Euphaus iacea 



Amphipoda 



Decapoda (Crustacea) 



Pteropoda 



Heteropoda 



Gastropoda (Larvae) 



Pelecypoda 



Thaliacea 



Append icularia 



Fish (Larvae) 



Fish (Eggs) 



Halosphaera 



Table 12. --Ranks for average numbers of organisms per 1,000 m. of water strained by the 

 different nets on the Smith cruises. (The layer--upper , middle, lower--in which organ- 



10 



