oHS 1)1 ATOM AC?:. K — HHIZOSOLKXIA 



(h-tohi-r: oB' iN. Bl^ W., rare. 

 Xovcmhc/-: 51 - N. I'i)^ W.. rare. 



Temperature: n.D, mean of 81 obs., max. 2>i.7. min. 5a 

 Salinity: ;)5.:ui, mean of 29 obs., max. 35. sa. min. Ht.ni.' 

 Plankton-type. Noted from the Mediterranean, tiie Indian and 

 Pacific Ocean. It follows in the Atlantic the African coa.st to the 

 Azores and spreads in the spring towards tlie English Channel. It 

 reached in May 60"" N. and Scotland, in August S. Iceland, in Sep- 

 tember N. Iceland. From S. Iceland it crossed Denmark's Sound for 

 K. (Greenland. It occurred also in the western Atlantic, but was 

 there much rarer. — N. 



RHIZOSOLENIA ARAFURENSIS Cxsth. 

 ;H. Peragallo: Le Diatumiste 1892 PI. XV lig. H.) 

 M(u-i-/i: 45" N. 'Mr W., rare. 



Temperature: 8. 



Salinity: ^55..;,^. 



Plankton-type. Found in tlie Arafura Sea. — J) ? S ?. 



RHIZOSOLENIA ATLANTICA I'eragallo. 



Le Diatomiste 1892 IM. XVII lig. 4—5.) 



1S9S Mnrclr. 42" N. 42^ W. to 41' N. 49' W. 



Xoceinher: 24'"N. 29' W., common; 51' N. 2(f W.; 42- N. 

 64° W. 



Ih'cciiiliiT: IS' N. ()7- \V. 

 FS99 Fi-hrnarii : l^'r N. 40" W. 



Temperature: 11 to 22. ii, exce]itionallv 2H.s. 

 Salinity: 85 to 36. a.-,. 

 Plankton-type: S. 



' Only sucli samples in vvliicli this species occurred in some al)Uii(laiice 

 liave lieen considered in calculating the means. 



