446 



Birge — The Crustacea of the Plankton. 



Table H. — D. retrocurva. Average, maximum, and minimum num- 

 bers. Percentile vertical distribution. 



1895. 



July 1-15... 

 July 16-31.. 

 Aug. 1-15.. 

 Aug. 16-31. 

 Sept. 1-15.. 

 Sept. 16-30. 

 Oct. 1-15... 

 Oct. 16-31.. 

 Nov. 1-15. . . 

 Nov. 16-30.. 

 Dec. 1-15... 

 Dec. 16-31.. 



1896. 

 July 16-31.. 

 Aug. 1-15. . 

 Aug. 16-31. 

 Sept. 1-15.. 

 Sept. 16-30. 

 Oct. 1-15... 

 Oct. 16-31.. 

 Nov. 1-15. . . 



Av. 



9 

 31 

 68 

 50 

 23.8 

 59.6 

 72.5 

 70.9 

 59.3 

 24.2 

 5.0 

 0.7 



2.5 



27.6 



57.1 



157.7 



228.6 



199.3 



92.7 



9.9 



Max. 



14.6 

 59.7 



154.8 

 96.0 

 37.5 

 74.4 



103.6 

 65.5 

 79.5 

 37.5 

 11.4 

 0.9 



Min. 



0.0 

 3.5 

 8.9 

 20.5 

 11.5 

 21.6 

 50.9 

 33.7 



42.6 



19 

 1 



0.0 



Per cent, in each 3 m. level. 



0-3. 



47.0 

 50.0 

 37.1 

 41.1 

 46.4 

 33 8 

 35.9 

 29.2 

 24.2 

 30.7 

 3.7 

 0.0 



Irreg 

 59.0 

 36.5 

 26.2 

 26.5 

 26.4 

 43.5 

 29.0 



3-6. 



6-9. 



25.5 

 24.0 

 26.1 

 21.3 

 23.5 

 24.1 

 15.2 

 10.0 

 20.2 

 20.2 

 0.0 

 0.0 



ular 

 32.4 

 23.2 

 17.3 



18.4 

 20.0 

 18.8 

 30.7 



13.1 

 24.8 

 16.8 

 22.7 

 20.3 



15.7 

 17.9 

 12.3 

 12.6 

 14.9 

 41.3 

 27.3 



near 

 8.0 

 24.0 

 19.3 

 15. 

 14. 



0.0 



9-12, 



12-15 



14.4 



0.0 



1.2 



0.0 



18.5 



1.3 



13.7 



1.1 



6.4 



2.9 



11.6 



7.8 



7.5 



11.7 



10.6 



9.1 



18.4 



14.21 



12.3 



10.0 



17.5 



18.7 



36.4 



18.2 



surfa 



ce. 



0.4 



0.2 



14.0 



2.3 



19.4 



12.4 



16.3 



12.0 



10.8 



13.0 



10.8 



10.4 



0.0 



13.5 



15-18. 



0.0 

 0.0 



0.1 



0.1 



0.5 



6.9 



11.7 



28.7 



10.3 



11.9 



18.7 



18.2 



0.0 



0.0 



5.3 



11.4 



15.5 



7.6 



26.8 



