H40 DIATOM AC.K.K — RHIZOSOI-EXIA 



March: 12" N. 51" W.; 15" N. 49" W.; ;}6^ N. IJO" W.; 1)5"— 



45° N. 41^"— 86" W. 

 May: 20"— 2H° N. 60"— 5<V" W. 

 June: 24° N. 58" W. 

 August — September: Azores. 

 October: 21" S. 36" W.; Azores. 

 November: area between flio Janeiro, 19" S. HI" W. and 24" 



S. 29" W.; Azores; 44" N. 55" W. 

 December: 29" S. 49" W.; Azores. 

 1899 January: 45" N. 49" W. 

 February: 3i° N. 40" W. 



Temperature: 20. i, mean of 83 obs., max. 27. i, min. 8. 



Salinity: H5.st, mean of 17 obs., max. 37.26, min. 32. sv. 



Plankton-type. This species occurs in the Mediterranean and 

 belongs to the tropical Atlantic, east of South America, and follows 

 the North Equatorial current into the Caribbean Sea, the Floridti 

 Current to Newfoundland Banks and the Azores. It occurs also in tiie 

 Sargasso Sea. — ■ 1>. 



RHIZOSOLENIA (ALATA VAR.) CORPULENTA Cl.' 



(A. Treatise on the t'hyto-plankton IM. II (ig. 11. 



1898 February: 5" S. 8" E. 



March: T N. 35° W.; 43" N. 48" W. to W N. 36 W. 



April: 47° N. 39° W. to 49" N. 22° W. 



May: 49° N. 23° W.; 43° N. 45° W. to 41° N. 63" AV. 



June: 10° N. 53° W.; 45° N. 41° W. 



Auyust: 63" N. 25° W., very rare. 



Sept<>ml>er: 64" N. 32° W ; 41" N. 65 \V. 



October: 63" N. 16° W., rare; 57" N. 27° W. to 59" N. UV 



W., common at 16° — 21° W. 

 Xorember: 63° N. 13° W.; 5()" N. 30° W.; 43" N. (51" \V. to 



47° N. 41° W. 

 December: 62° N. 10" W. 



O-stenfehTs data used. 



