DlATOMACHyV; — RHIZOSOLESflA 'M', 



RHIZOSOLENIA SETIGERA Btw. 



(Ci.. Fifteenth annual report of the Fishery Board for Scotland, for 1896, pag. 



301 fig. 12). 



J 898 Marr/r. 1^ N. 55" W., common; 1-1° N. 21 W 

 Jiiiir'. 1(F N. 53° W. 



Temperature: 25.9, to 27.2 (tropical Atlantic); 14, u (tem)ierate 

 Atlantic). 



Salinity: ;5],h2 (tropical Atlantic). 



Plankton-type. The almost complete absence of this species in 

 the ocean proves that it is neritic form; its occurence north of South 

 America, as well as in the spring in the Skagerak, proves that this 

 species is a very eurythermous form. Schr6de:r mentions it form Nap- 

 les, — A7, Xm. Ai, 



RHIZOSOLENIA SHRUBSOLEI Cl,' 



(Peragai.lo: Le Diatomiste 1892 PI. XVII fig. 8. 9). 



1898 January: 20" N. 18" W. 

 February: .'Jr N. 73- W. 

 March: 1«-— 21° N. 20— 18-VV ; Azores; '\V N. 20" W,; 19^ 



N, 2(P W.; 1i" N. 1-8" W.; \\° N. ()()° W. 

 April: Azores; 49° N. 12" and 19° W.; 60° N. 4° W. 

 May: hl'^ N. 25" W. to ()()'" N. 9" W., more or less rare, 

 Jiile: area between 64° N. 22° W. and (>(»- N. 4°— 9^ W'., 



rare; 57° N. 34° W., rare. 

 July: area between 58° N. 32° W., (KP N. 23° W, (common), 



60° N, y W. and 58° N, 23° W., on the whole rare, 

 August: Azores; area between 58° N. 7° W., 60° N. 2° W,, 



and 60° N. 10° W., rare; ()3° N, 25° W, to 61° N. 32° \V., 



rare. 

 September: Faroes, common; 60° N. 2° W. 

 October: ()3° N. 12°— 13° W,, rare; Faroes, rare, 

 Xoveinlier: 63° N, 13"^ W., rare; Faroes, rare. 



Ostenfeld's data used. 



