474 Birge — Vertical Distribution of Pelagic Crustacea. 



Table Q— Vertical distribution by periods. 

 Period I— July 7-14. 



Depth. 



Average. 



Day. 



Night. 



Meters. 



No. 



Per cent. 



No. 



Per cent. 



No. 



Per cent. 



0—3 



1 



4 



27 



33 



34 



2 



.99 

 3.96 

 26.7 

 32.7 

 33.7 

 1.99 



2 



6 



28 



26 



12 



1 



2.67 



8.00 



37.3 



34.7 



* 16.0 



1.3 







2 



26 



41 



61 



2 







3—6 



6—9 



9—12 



1.51 

 19.7 

 31.06 



12—15 



46.2 



15—18 



1.51 



Total 



101 





75 





132 









Period II— July 16-19. 



Depths. 



Average. 



Day. 



Night. 



Meters. 



No. 



Per cent. 



No. 



Per cent. 



No. 



3 

 13 

 34 

 50 

 29 





 129 



Per cent. 



0—3 



3—6 



6—9 



3 



9 

 39 

 59 

 25 







2.22 



6.7 



28.9 



43.7 



18.5 







4 



7 

 41 

 65 

 22 







2.9 



5.0 



29 5 



46.8 



15.8 







2.3 



10.08 

 26.4 



9—12 



12—15 



15—18 



38.8 



22.5 











Total 



135 





139 















Period III— July 27-29. 



Depth. 



Average. 



Day. 



Night. 



Meters. 



No. 



Per cent. 



No. 

 



Per cent. 



No. 



Per cent. 



0—3 







0. 



0. 



1 



.83 



3—6 



5 



4.0 



3 



2.34 



< 



5.84 



6-9 



70 



56.0 



68 



53.13 



72 



60.00 



9—12 



48 



38.4 



55 



42.97 



40 



33.3 



12—15 



2 

 



1.6 

 



2 







1.56 

 0. 





 



0. 



15—18 



0. 



Total 



126 





128 





120 















