438 



Birge — The Crustacea of the Plankton. 



Table C. — Average number and percentile vertical distribution of the 



crustaeea. 









Per cent, in each 3 m. level. 







Av. No. 

































0-3. 



3-6. 



6-9. 



9-12. 



12-15. 



15-18. 



1894. 



1 















Julv 1-15 .... 



306.2 



45.7 



29.5 



16.9 



5.5 



1.9 



0.5 



July 16-31.... 



472.3 



51.2 



30.6 



12.3 



4.9 



0.8 



0.1 



Aug. 1-15 



401.1 



43.4 



27.3 



21.6 



7.6 



0.1 



0.1 



Aug. 16-31 . . . 



382.2 



42.6 



29.0 



21.1 



7.2 



0.1 



0.0 



Sept. 1-15 





No 

 46.2 



observa 

 26.0 



tions. 

 14.5 



9.8 



3.2 





Sept. 16-30... 



691.6 



0.3 



Oct. 1-15. 



820.8 



28.6 



20.8 



16.2 



14.4 



11.1 



8.9 



Oct. 16-31.... 



757.1 



21.0 



19.5 



17.6 



15.8 



16.4 



9.8 



Nov. 1-15 



571.4 



20.7 



18.6 



15.8 



19.8 



16.3 



8.8 



Nov. 16-30 





No 

 I 32.8 



observa 

 16.2 



tions. 

 14.4 



11.8 



12.4 





Dec. 1-15.... 

 Dec. 16-31.... 



I 219.9 



12.4 



1895. 

















Jan . 1-15 



Jan. 16-31... 



I 81.1 



I 25.5 



18.5 



17.4 



19.2 



9.6 



9.6 



Feb. 1-14.... 

 Feb. 15-28.... 



I 166.9 



I 9.6 



16.3 



11.9 



9.8 



26.1 



26.1 



Men. 1-15.. . . 



118.7 



14.2 



21.1 



15.6 



12.6 



9.2 



27.2 



Mch. 16-31.... 



164.5 



22.9 



21.3 



9.5 



9.5 



18.4 



18.4 



Apl. 1-15.... 



94.3 



32.8 



18.4 



11.7 



10.0 



13.5 



13.7 



Apl. 16-30.... 



229.4 



38.7 



23.3 



13.5 



8.3 



6.6 



9.6 



May 1-15 



940.2 



43 5 



24.8 



13.3 



7.2 



4.5 



6.7 



May 16-31.... 



1,419.5 



40.2 



19.4 



13.8 



8.2 



8.2 



10.0 



June 1-15 



1,256.6 



35.4 



20.0 



14.3 



10.7 



8.6 



10.9 



June 16-30... 



610.7 



43.0 



21.6 



15.5 



6.8 



4.7 



8.4 



July 1-15.... 



817.6 



52.6 



22.8 



17.0 



5.3 



1.5 



0.8 



July 16-31.... 



837.9 



42.9 



27.4 



24.4 



3.9 



0.7 



0.5 



Aug. 1-15.... 



689.1 



44.0 



26.9 



15.0 



12.0 



1.8 



0.2 



Aug. 16-31.... 



622.8 



42.0 



21.7 



18.4 



15.8 



1.6 



0.3 



Sept. 1-15 



669.7 



39.8 



26.9 



20.0 



9.6 



2.9 



0.8 



Sept. 16-30... 



928.1 



30.9 



20.7 



15.1 



11.4 



13.9 



7.9 



Oct. 1-15 



767.8 



29.5 



15.1 



14.6 



13.7 



14.0 



13.0 



Oct. 16-31.... 



478.5 



26.6 



15.2 



15.2 



16.2 



13.3 



13.5 



Nov. 1-15.... 



391.5 



23.8 



18.8 



14.0 



17.4 



14.3 



11.5 



Nov. 16-30.... 



331.8 



22.6 



18.2 



16.3 



17.3 



13.2 



12.4 



Dec. 1-15.... 



320.8 



31.9 



27.1 



16.3 



10.2 



8.1 



6.2 



Dec. 16-31.... 



313.1 



43.7 



15.6 



9.6 



14.7 



9.4 



6.9 



1896. 

















Jan. 1-15 



294.1 



36.6 



18.0 



15.2 



7.4 



10.5 



12.2 



Jan. 16-31.... 



240.9 



36.5 



14.1 



14.1 



8.6 



8.6 



18.1 



Feb. 1-14.... 



219.0 



37.1 



14.3 



10.0 



11.3 



10.1 



17.0 



Feb. 15-29.... 



191.7 



32.2 



17.1 



12.1 



12.1 



12.1 



14.3 



Mch. 1-15 





No 

 29.7 



observa 

 15.4 



tions. 



22.7 



14.1 



10.0 





Mch. 16-31 . . . 



281.6 



8.1 



Apl. 1-15.... 



480.4 



16.8 



12.4 



21.5 



22.5 



13.4 



13.4 



Apl. 16-30.... 



1,184.3 



40.6 



24.6 



14.9 



11.2 



5.7 



2.8 



May 1-15.... 



2,398.2 



31.1 



21.9 



18.9 



12.0 



8.4 



7.6 



