452 Birge — Vertical Distribution of Pelagic Crustacea. 



STATISTICS OF DIAPTOMUS. 



Tables H and I show the average catch, the percentile dis- 

 tribution, and the average for day and night for the month and 

 for each period. The percentile relations are shown in Plate 

 IX, the distribution by day and ^xght in PI. X, fig. 1. 



Table H — Results for the month. 



Depth. 



Obs. 



Average . 





Day. 







Night. 



Meters. 



No. 



Per cent. 



52.80 



29.27 



14.02 



3.15 



.14 



09 



Obs. 



No. 



Per cent. 



Obs. 



26 

 26 

 26 

 26 

 24 

 22 



No. 



1773 



1111 



735 



157 



6 



4 



3786 



Per cent . 



0—3 



59 

 57 

 58 

 56 

 55 

 49 



2229 



1257 



592 



133 



6 



4 



4221 



33 

 31 

 32 

 30 

 31 

 27 



2589 



1379 



475 



112 



6 



4 



4565 



56.71 



30.20. 



10.40 



2.45 



.13 



.08 



46.83 



3—6 



6—9 



29.34 

 19.41 



9—12 



4.14 



12—15 



15—18 



.15 

 .10 







Total 















Table I— Period I- July 7-14—9 Series (5 Day, 4 Night). 



Depth. 



Average. / 



Day. 



Night. 



Meters. 



No. 



Per cent. 



No. 



Per cent. 



No. 



Per cent. 



0—3 



3—6 



1860 



1201 



593 



120 



18 



16 



3803 



47 9 



31.6 



15.6 



3.1 



.4 



.4 



1726 

 1174 



591 



85 



16 



12 



3004 



47 89 



32 57 



16.39 



2.35 



.44 



33 



2028 



1228 



596 



163 



[ 



20 



20 



4055 



50.01 

 30 28 



6-9 



9—12 



12—15 



15—18 



Total 



14.69 

 4.00 



.49 

 .4) 



