"■'- IJIATOMACK/I', — OIlyl.TOCEROS 



CHiETOCEROS BOTTNICUS Ci,. 



(Bih. Kongl. Sv. \CI,ensk. Akad. Handl. Vol. XXI, 4. n. 8 pag. 14 PI. I) 



t898 Mai/: 1-1° N. K5 W. 

 1899 Mini: Ih N. 2^ 30' E, 

 Juiij: 74° N. 2U W. 



Temperature: — O.i to — 1. 



Salinity: 29.9.-, to 34.»s, 



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

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

 whole Baltic. — A^/. 



CH^TOCEROS (BOREALIS VAR.) BRIGHTWELLII Cl. 



(Ci,. a Treatise on the Phyto-plankton PI. I fig. 2.) 



1898 March: 58' N. 6° E.; 41^ X. (iO W. 

 April: 41° N. 58= W. 



June: 68- N. 13^ E.; 65= N. 29- \V. 

 September: 73" N. 19- E. to 76° N. 13"^ K. 



1899 May: 61° N. 1° E. 



June: 62° N. 2' E.: 72-— 73^ N. 19—18" E. 

 Jnlir- 74"— 71° N. 20°— 21° \V. 

 August: 73" X. 25" W. 



Tempepatupe: 8.8, mean of 12 obs., max. 16, min. b.e\. 



Salinity: 35.oo, mean af 12 obs., max. 35.54, min. 34.33. 



Planltton-type. This species occurs usually associated with 

 Tricho- and Chseto-plankton, but was remarkably scarce in 1898 and 

 1899. Schroder mentions it from Xaples. — 7'. 



CHiETOCEROS CINCTUS Grax.^ 



(Den Norske Nordhavsexped. 1876—78 Dial. etc. PI. II fig. 23—27.) 



1898 May: Shetlands; Orkneys. 



June: 60° N. 4°— 8" W., very rare; 63^ N. 13" W., rare; 63" 

 N. 18° W., not rare; S. of Iceland, common. 



Ostenfeld's data used. 



