SEA-FLSHERTES LABORATORY. 



1G5 



Date 



and 



Depth. 



No. 



of 



hauls. 



Vol. 

 in c.c. 

 average. 



Greatest 

 per cent. 

 deviation 



from 

 average. 



Dia- 

 toms 

 ditto. 



Dinofla- 



gellates 

 ditto. 



Cope- 



poda 

 ditto. 



Cope- 

 pod 

 Nauplii. 



ditto. 



April 3— 



8 fathoms 







0-2 







1 + 24 



-42 

 + 24 



-14 

 + 21 



-19 



+ 39 



April 6 — 

 20 fathoms 



5 



0-58 



f-14 



Us 



-51 



+ 41 



-53 



+ 56 



-50 



+ 42 



-44 



+ 41 



April 8- 

 20 fathoms 



6 



0-52 



r-23 



1 + 15 



-24 



+ 17 



-20 



+ 15 



-40 



+ 22 



-39 



+ 22 



April 13— 

 8 fathoms 



5 



0-48 



1+25 



-41 



+ 73 



-65 



+ 44 



-22 

 + 33 



-57 

 + 129 



May 25— 

 20 fathoms 



4 



16125 



1+21 



-21 

 + 15 



-22 

 + 23 



-72 

 + 60 



-33 



+ 56 



August 7 — 

 20 f ..thorns 



4 



0-5 







r-70 



\+59 



-27 

 + 17 



-13 



+32 



-21 

 + 10 



September 16 — 

 20 fathoms 



4 



61 



r-26 



1+23 



-36 



+ 30 



— 22 

 + 36 



-36 



+ 53 



-31 



+ 37 



importance and may be omitted. Of the 24 species of Diatoms 



as a general rule if a species occurs in one of the hauls of a series 



it occurs in all, and in many cases in much the same proportions 



in all ; that is, there may be two or three or even more times 



as many individual cells in one haul as in another, but all will 



be in the tens, or in the hundreds, or the thousands, or millions. 



The following are a few examples : — 



April 3— 



Biddulphia mobiliensis, 1,800, 1,800, 3,800, 4,000, 4,400, 5,400 ; 

 Coscinodiscus radiatus, 1,600, 2,600, 2,600, 2,800, 2,800, 2,200 ; 

 Lauderia borealis, 10, 20, 50, 40, 40, 20 ; 

 Streplotheca lhamensis, 40, 30, 30, 40, 40, 60 ; 



April 8— 



Asterionella bleakeleyi, 12,000, 20,000, 16,000, 36,000, 28,000, 40,000 ; 

 Lauderia borealis, 200, 200, 240, 200, 120, 200 ; 

 Rhizosolenia setigera, 40, 40, 80, 80, 40, 40 ; 



