jio DISCOVERY REPORTS 



surface layers. In deep water below 250 m. Fraser records only ten free, Fry and I, in a very much 

 larger series of analyses, finding only forty. In other words the First Calyptopis in deep water is 

 nearly always associated with moulting Metanauplii. Even in such free occurrences as have been 



FURCILIAS 1-3 

 I400-I800 I800 -2200 2200-0200 0200-0600 O6O0-IO00 I000-I400 



O- 



50- 



lOO- 



250- 



SCO- 



750 



1000 



O- 



50- 



100- 



250- 



500- 



750- 



1000^ 



—I--T- 



174 



1155 



268 



36 



10 



276 



18 



24 



299 



4 1 (40) 



692 (492) 



36 



(21) 



(3) 



0) 



12 



(28) 



(68) 



(31) 



(10) 



(28) 



598 



1418 



4B2 



51(26) 270(209) 



36(35) 



(25) 



100 



250 



SOO 



750 



1000 



-0 



50 



100 



2SO 



500 

 ■750 

 •1000 



SO 



100 



250 



SOO 



750 



1000 



fURCILIAS 4-6 

 I400-I8OO 1800-2200 2200-0200 0200-0600 0600-I000 I000-I400 



II -il 



T 



o 



so 



100 



250 



500 



750 



1000 



(42) 



(129) 



(31) 



(17) 



(45) 



(35) 



O 

 SO 



-100 



-250 



SOO 



-750 



-1000 



O 

 SO 



100 



250 

 500 

 750 

 1000 



Fig. 1 1 . Four-hourly vertical distribution of the Furcilia stages showing absence of rhythmic diurnal movement and more or 

 less permanent massing of the main concentrations high up in the Antarctic surface layer. For further explanation see 

 legend to Fig. 9. 



recorded, however (Fig. 10), there is little indication of any pronounced or rhythmic diurnal 

 vertical movement and equally little of any mass descent into the warm core of the deep water during 

 the dayUght hours. 



The Furcilias (Fig. 11) appear to undergo much the same rather restricted vertical movement, 

 Furcilias 4-6, more so perhaps than the early Furcilias, showing a distinct tendency to be massed 

 near the surface both by day and by night. 



