PLEUROMAMMA 

 ROBUSTA 



00 04 ok 12 16 20 DO 04 OS 00 04 08 12 16 20 00 04 08 00 04 08 12 IS 20 00 04 08 



200 



100 



EUPHAU5IA 



VALLENTINI/ 

 v T 



00 04 08 12 16 20 00 D4 08 00 04 06 12 16 20 00 04 OS 00 04 08 12 16 20 00 04 08 



do 04 o'a li is 20 do 04 o'a oo 04 os a is 20 00 04 os 00 04 os 12 is 20 00 04 08 



200 



00 04 08 12 16 20 00 04 08 00 04 OB 12 16 20 00 04 08 00 04 08 12 16 20 00 04 08 



400 



200- 



do 04 da i2 ife 2b do 04 oe do 04- de <z ife 20 do 04 os 00 04 oe 12 ie 20 00 04 oa 



Fig. 18. Diurnal variations of macroplankton species. The curves show the average number per haul at 

 four-hour intervals. Midnight and midday are accentuated by black and white triangles respectively. The 

 species are arranged roughly in order of the magnitude of their diurnal variation (see Table I, p. 95). 



