78 COPKPODA — ONC.^iA 



September: 12°— 1^° N. 19^ E.; 76° N. 15° E. (deep sea haul 



Aiiriv.) 

 November: Azores; 56° N. 23°— 30° W.; 42° N. 63° W. 

 December: Azores. 

 1899 March: Azores; 44° N. 16° W. ; 65° N. 13° W. 

 May: 61°— 64° N. 6°— 9° W. 



June: 62°— 67° N. 1° E.— 3° W., hauls from 550 metres. 

 July: 72° N-. 22° W., haul from 260 metres. 

 September: 66° N. 3° W., hauls from 500 and 200 metres. 

 October: between 52° N. 21° W., 53° N. 25° W. and 56° N. 



23° W., not rare. 

 November: 51° N. 21°-34° W., rare; 49° N. 40° W., rare. 



Temperature: n) in the northern Atlantic 5, mean of 35 obs., 

 max. 12, min. — 0.5, b) in the temperate Atlantic 16..s, mean of 7 

 obs., max. 22, min. 11. 



Salinity: a) in the northern Atlantic 35. 02, mean of 36 obs., 

 max. 35.41, min. 33.66, b) in the temperate Atlantic 35.8i>, mean of 

 5 obs., max. 36.69, min. 34.oi. 



Plankton-type. Noted from the Mediterranean. This species 

 occurs only rarely in the temperate Atlantic, in the region of the 

 Azores and there associated with arctic forms, hi the northern 

 Atlantic it is much more frequent and has been seen as far as 72° 

 N. on the west and 78° N. on the east. There is thus more probability 

 that it is an arctic than a temperate form. The occurrence near the 

 Azores and in the Mediterranean must then be accounted for by 

 arctic currents to these regions. Still, the salinity is higher than 

 for Tricho-plankton as a rule. On the other hand this species occur.s 

 frequently in the northern Atlantic among masses of Ca/atuis pn- 

 marchicus. — T? 



ONC^A SUBTILIS (liEsim. 



1898 April: 39° N. 24° W., common. 

 Juiw: 46° N. 11° VV., common. 

 Srptember: 45°— 47° N. 14°— 9°, scare. 



1899 March: 46° N. 11° W., common. 

 May: 32° S. 13° E., rare. 

 Auynst: 48°— 49° N. 13°— 14° W. 

 October: 52° N. 14° W., rare. 



