HfjS 



1)IAT()MA(;k/V, -thalassiothrix 



Ani/iin!: ' S. of Iceland, rare; Davis's Strait, (W N. r):V — ofi' 



W., very rare; i-'ilnies, rare; oS" N. 2" W., rare; Azores, very 



rare. 

 Xc/iiciiihrr: ()() N. IH \\',, common; Faroes, not rare; o'.)' N. 



1 VV., to bd- N. 10 W., more or less rare; (IH' N. 2;')- W. 



to iM' N. ;5()' W., rare; f)'.! N. 1',) W, and («»" N, 5:-}'' W., 



rare. 

 (h-tolic/-. Faroes to hi X. 27 \V. and oH N. :52 \V., rare; IH- 



N. :iS'- W., rare; l!" N. :">() \v., rare. 

 Xorciiihcr: Iceland to the Faroes, rare; oO' N. 10- W. to M'" 



N. 12 \V., on the whole rare, but common at hV'' N. 20 \V.: 



1H- N. t)l° \V. to 12 N. 64 W., rare. 

 Dri'rnihrf; ;')() N. U W., rare; 4;) N. 10 \v., rare; IIP N. 



HO' W. to 1-1° N. (')() W., rare to common. 

 1899 January. 4;! N. hi- W., rare. 



February. ;!1^ N. iO' W., very rare. 



M/irrli: Faroes, rare; 4U- .\. (t- W., not rare; il'-' N. 7° W., 



rare; Azores, rare. 

 A]>ril: 4U" N. 7"^ \V., rare; 41° N. 1;") \V., not rare. 

 May. Faroes, rare; nS' N. 'r E., rare; 51° N. 20- W., rare; 



50" N. Hi)" W., rare; 47- — 1H" N. 50- — 1-5" \V., common. 

 .Junr: (id- N. H" W to 70" N. IH" W, rare. 

 July. 56- N. ;>s- W. to 5H" N. 51 W'., as a rule rare, but 



very common at 15" W. 

 September: 7H" N. IH" E., not rare. 

 Oetnber: 51)" N. ;')1° W., rare. 

 Xovcmbi'r: 51 N. IH'^ W., rare. 



Temperature: !).(;, mean of 1i) obs., max. 14, rain. 4. Only 

 such samples considered as contained this species abundantly) 



Salinity: Hi.js. mean of 21 obs., max. 35.87, min. 32.s2. 



Plankton-type. This species was found by the Vega Expe- 

 dition abundantly in the Bering Sea. It is represented in the An- 

 tarctic seas by a much coarser form, which was found there by 

 the Challenger Expedition in great abundancy. It is a typical arctic 

 form, that has about the same geographical distribution ns Ca/ai/ns 

 finiiKireliieus. — T. 



