IflATOMAC.K.T, — (.Il.KTOf;KR()S '2\^S^ 



Aj)ri/ : 11 N. lo W.. I'urc; 1H^ i\. '.» W.. raic; Fiiiucs, roin- 



nion; Wcstmaniu), coiumoii. 

 Mni/: as a rule rare from (U N. T K. to llio Shcllaiids atui 



the Fiii'oes, where not rare; rare hetween Ihe Fiinies ami 



Iceland; cominon at Westinannao; oO X. .'U) W. ami is 



N. If)" W.. rare; 47 N. oO" AV., i-onnnou. 

 June: Westinannao, common; 62' N. 1 K. t<> t)7 N. :> W.. 



very common; more or less rare round .Ian Mayen; 71 N. 



9- W. to 7H N. i- W. as a ride rare; between Norway and 



Beeren Island not rare; 8W. and S. of Spitzbergen, rare. 

 Jidi/: NW. of Spitzbergen. rare; 78 N. 53^ K., rare; 75 N. 



18^ W. to 11' N. 21 AV., rare to connnon; 52 — oH N. 



51^ — 51' W., not rare. 

 AiH/iisf: HO' N. 51^ E. and 76' N. id Iv, rare; 70' 5(i' N. 



22' H3' W., common; 71^—73'" N. 20—27 W.. more or 



less rare. 

 Septcmbi'i-: SI N. IB K. to 73 N. U* K.. common lo rare; 



69° N. 13^ W., rare; 53 N. 52 W.. rare. 

 ()ci(,hrf: 53 X. 31' W., rare. 



Temperature: 7.,;, mean of 17 obs..' max. 13..-,. min. 0.,;. 



Salinity: 3i..-,o, mean of 17 obs., max. 35.9i. min. 30..,n. 



Plankton-type. I have found this species in a coiled k.h 

 fiiim Pii^-et s Sound. Tlie mean temperature and salinity prove that 

 this species is an arctic form, whicli however spreads by currents 

 far to the south and propagates in water of so high a salinitv as 

 35 p. m. — ('.. T. (('. in 35 p. m. T. in 31 p. m. salinity.) 



CHiETOCEROS DENSUS Cr.. 



(C. bnri-(ili< riir. <l('ii.<. Cl. A Tivatise on Llir rhylo-|ilaiikU.ii i'l. I lit;. '^, i. 



1898 .laniKtni: 12 X. 19 W.; K) N. IS AV. (common. 



Marclr. 25 X. Kr W.; 49- X. IS' W.; 19^ N. 2' W.; 45' N. 



36 and 40 W. (rare); 41' N. 49 W. 

 A},rll : 5Cr N. 3- W.; 47' X. 40 W. 



' Tiu" moans arc calculated from such samples only as containea this species 

 ahundanllv. 



