THE LARVAL STAGES 



109 



I400-I800 I800-2200 2200-0200 0200-0600 0500-I000 lOOO- 1400 



100 



250 



SOO 



750 



1000 



IT 



T^ 



A 



so 



100 



•250 



•SOO 



•750 



1000 



SO 



100 



2 SO 



SOO 



7 SO 



1000 



C48) 



(120) 



(37) 



(15) 



(38) 



(44) 



SO 

 100 

 2 SO 



•t-soo 



7SO 

 1000 



Fig. 9. Four-hourly vertical distribution of the combined Calyptopis stages showing absence of any pronounced diurnal 

 movement. The distribution here is worked out from data obtained at oceanic stations where the First Calyptopis occurred 

 free, the number of stations made during each 4-hr. period, where such fell within the life-span of the Calyptopes, being 

 shown in brackets at the bottom of the catch-table. These include negative stations. The bracketed numbers in the catch- 

 columns indicate the considerable part of the total catch (unbracketed numbers) which was obtained from vessels lying beam 

 on to wind and sea in winds of force 4-5 or more. 



!400-l80O I8OO-22OO 2200-0200 O2OO-O6OOO6OO-IOOO I000-I400 



o 



50- 

 100 



2SO 



SOO 



750' 



1000 



SO 

 100- 

 2SO- 

 SOO 

 750- 

 lOOO- 



T 



T» 



o 



-so 

 -100 



2SO 

 SOO 

 -750 

 1000 



412 



32 



9S 



3S 



246 



162 



20 



32 



112 



470 



23 



(46) 



(Ml) 



(37) 



(15) 



(37) 



SO 



100 



2SO 



500 



■7S0 



1000 



(44) 



Fig. 10. Four-hourly vertical distribution of the First Calyptopis based on data from oceanic stations where it occurred free. 

 Note again the figures in brackets showing the number of stations (including negative stations) made during each 4-hr. 

 period where such fell within the life-span of this stage in the plankton. 



free Calyptopes is revealed to be rather small. It certainly, for instance, does not seem to involve 

 them in any very large-scale daily descent into the vv^arm current, and suggests too that such 

 vertical movement as may be taking place, whether it be diurnal or not, is taking place in the main 

 within the limits of the Antarctic surface layer. 



Owing to its being so consistently involved in the developmental ascent (p. 90, Tables 13 and 14) 

 substantial numbers of First Calyptopes, as Table 15 shows, are seldom encountered free, even in the 



