292 I)1AT0:\L\CK.K C.H.+TOr.EROS 



CHiETOCEROS BOTTNICUS Ci.. 



(Bih. Kt.ngl. Sv. Vftensk. Akad. liandl. Vol. XXI, 4. n. S pag. 14- PI. 1 



1898 Mail: I'l N. KV W. 



1899 May: 7b' N. 2^ 30' K, 

 Jtih/: 74^ N. 20'^ W. 



Temperature: — O.i in — 1. 



Salinity: 29.i..-, to H4.93', 



Plankton-type. This specie.s is evidently an arctic neritic form, 

 only occasionally occurring in the. oceans. It is common in the 

 whole Baltic. — Xfj. 



CHi^TOCEROS (BOREALIS VAR.) BRIGHTWELLII Cl. 



iCi.. a Treatise on the Piiyto-plankton PI. I (ig. 2.) 



1898 Marrlr. 58^ N. ir K.; 4-1^ N. (50^ W. 

 April: W" N. b^- W. 



Junr: 68^ N. 13^ K.; 65^ N. 29^ W. 

 Scptritiber: 78' N. 19 K. to 76- N. l;*.^ K. 



1899 Mai/: 61' N. 1' E. 



Jifiic: 62' N. 2' E.; 72^—7;}' N. 19 — IS E. 

 Jn/,/: I^—IV- N. 20'— 21' W. 

 Aiffjiisi: 7H' X. 25' W. 



Temperature: 8.1;, mean of 12 obs., max. 16, min. 5.(u. 



Salinity: 'SS.oo, mean af 12 obs., max. 35.54, min. 34.33. 



Plankton-type. This species occurs usually associated with 

 Tricho- and (Ihtcto-plankton, but was remarkably scarce in 1898 and 

 1899. SciiRoDKii mentions it from Naples. — J\ 



CHiETOCEROS CINCTUS Grax.' 



(Den iXorske Nordhavsexped. 1876—78 Dial. etc. 1*1. II iig. 28—27.) 



1898 Mai/: Shetlands; Orkneys. 



Jii/a-: ()0' N. 4'— 8' W., very rare; 6:5 N. 13' W., rare; 63- 

 N. 18' W., not rare; S. of Iceland, connnon. 



' Ostcnfeld's data used. 



