124 



DISCOVERY REPORTS 



CALANU5 

 SIMILLIMUS 



CALANUS CALANUS RHIN- CTENO- MICRO- 



PROPINQUUS ACUTU5 CALANUS CALANUS CALANUS 



GIGAS VANUS PYGMAEU5 



100- 



^250 



0- 

 100- 



250- 



in 



UJ 



a: 

 F 



UJ 



z500- 



X 



H 

 o_ 



UJ 

 Q 



750- 



1000- 



* 



SHALLOW WATER STATIONS 



3k. 

 7fi 



r 



© 



DEEP WATER STATIONS 



SCALE 



10 



£[£ = INSUFFICIENT NUMBERS 



20 30 40 ^ 

 I I I % PER 50 Ml. DEPTH 



(H) - NUMBER OF STATIONS FROM WHICH 

 AVERAGE PERCENTAGES ARE TAKEN 



Fig- 55- Diagrams showing the mean depth distribution of the commoner species of Copepoda at shallow- 

 and deep-water stations. Proportions expressed as percentages per 50 m. depth. 



with the water-movement chart in Fig. 6. The series of consecutive N 100 H nets 

 described on p. 252 indicated that it occurred in well-defined patches. 



The species was first found in the Antarctic by the 'Challenger', 1 and has subse- 

 quently been recorded by most Antarctic expeditions: 'Belgica', 2 National Antarctic 

 ('Discovery'), 3 'Gauss', 4 'Scotia', 5 'Terra Nova', 6 'Aurora' 7 and 'Vikingen'. 8 Farran 

 (1929) in his report on the Terra Nova collection writes as follows: 



One of the most characteristic and plentiful of the Antarctic copepods, though not so abundant as 

 Calanus acutus. It occurred on almost every station within the Antarctic circle, adults, mainly fe- 

 males, being common between 66° 30' and 76 S, but scarce under the ice south of 76 S. North of 

 66° 30' very few adults were found though the younger stages were abundant on several stations. The 

 most northern point at which an adult female was taken was 54 38' S. 



It was "by far the most abundant of all the Copepods" in the Aurora collections, 

 and was very common at the winter quarters of the Gauss Expedition, approximately 



1 Brady (1883). - Giesbrecht (1902). 3 Wolfenden (1908). 4 Wolfenden (1911). 



5 Scott (1912). 6 Farran (1929). ' Brady (1918). 8 Ottestad (1932). 



