234 



DISCOVERY REPORTS 



HOUR 



13 

 r~ AJ 



15 IB 



B 20 



2J 23 



2 3 



6 7 



a 



gg~3gg~-g-ggggi:S3 s~SSSSg-~S5S5 5-~S5S~SS5 335 



STATION S i 

 g" 



m to r~ o 



JIUlu, IfltniOtfl 



3gg3 3Sg 



wt cn in o _ 



m ^ *t = S f^J o 



tn m m in f) in ro 

 333g" 3~ 



200 



Fig. 99. Chart showing the diurnal depth distribution of Calanus simillimus as sampled by the series of 

 N 70 H nets. All N 70 H stations have been arranged in order of time of day from noon to noon, and the 

 depth position of each net shown either by a number representing the C. simillimus taken or by a dot in- 

 dicating no C. simillimus taken. The shaded portions of the chart represent stations taken between sunset 

 and sunrise (the separation of St. WS 1 10 from the rest of the night stations is due to this station being taken 

 in May, i.e. the late autumn, whereas most of the other stations are taken in December-January). The 

 unbroken line connects the maximum number at each station, and the broken line indicates the approximate 

 normal vertical migration of the species. 



HOUR 



13 14 



15 16 



IB 



19 20 21 23 



2 3 



5 7 



10 II 



to r^^J ^"mo — .°1 — h- o^rrn m _ru ~ 4 w 113 UrOOrfl 



[r)WLominLnLnLT f i(\jLO[ntni/iLnuiuii/iwiw( f tfyLO l ^L/]iritniotfH f iw in ^i/nnLon 

 g-gg~ggg~-g-gggg3gg g~ggggg~~S5ggg- 



STATION 



m r> oi m to t\J 

 ~ggg~ 



r- en co _ «? co 

 ^- m en i^- **■ to 

 en tn in m m in 

 3gg _ 3g 



in m <n C\J *r 



in m in in m 

 ggggg 



co * en n o 



in ^ *f = 2 rvj o 



ininninn Jin 



333g~ 3 ~ 



200 



4 XZ3M- -62 3 



-7312- 



Fig. ioo. Chart showing the diurnal depth distribution of Drepanopus pectinatus. The arrangement of the 

 chart is similar to that described in the legend of Fig. 99. 



Calanus propinquus does not show such a regular migration as does C. simillimus, nor 

 does it come to the surface so early or so rapidly; but it comes more usually from a 

 somewhat greater depth. In Fig. 103 the irregularity of its migrational behaviour may 

 be judged from the continuous line which connects the positions of the net hauls con- 

 taining the greatest numbers at each station ; at some stations at night they are up and 

 some down, nevertheless a general trend of migration can be seen which is indicated by 

 the broken line. The large numbers taken in the deepest net at St. WS 70, marked with 



