H.'M niATOMACKyK — M TZSCIIIA 



June: Kiiriies, rare to (■(uninon; Denmark's Sound, common. 

 July: Fiinu" Channel; (>() — 58 N. 2H" — H'J W.; comiiion. 

 Aurjiist: Wt'stniannao, loiiimon; fio- N. :-53" W., not rare. 

 Sfpiciithcr: Fiirues, very rommon; HI N. H2 W., common; 

 til N. 31'" \V., rare. 



Temperature: H.u, mean of 15 olis., max. 11. min. 5.:,. 



Salinity: Hi.ii«, mean of 15 obs., max. ;55.i:i, min. 34-. os. 



Plankton-type. The abundant occurrence of this species in the 

 spring in the northern Atlantic makes it probable that it belongs to 

 the ('.ha^to-plankton. — T. y 



NITZSCHIA FRIGIDA (mux 



;Grax Ribliotheca botanica Heft. 42 PI. I fij;. 11.) 



185)9 July: li —In N. 20—18 W., rare. 



Temperature: — Os lo — o.i;. 

 Salinity: 29.9i5. 



Plankton-type. Noted from E. and W. (Ireenland, Harent's 

 Sea, Kara Sea and the Baltic (Hay of Finland, xVland). - Xf/. 



NITZSCHIA LINEOLA Ci.. 



(Fifteenth annual report of the Fishery Board for Scotland, for IS'.tH 

 pag. BOO fig. 11.) 



1898 Marrh: Azores; 41° N. 23° W.; 44° -N. 17^ W. 

 ApK'L- Azores; 50' N. 9' W.; 19" N. 22—25' W. 

 Avfiiist: Azores. 



Temperature: H », mean of 7 obs., max. 28.?, min. 11. ». 

 Salinity: 35.io, mean of 4 obs., max. 35. sv, min. 35. 1 7. 

 Plankton-type : N 



NITZSCHIA PUNGENS Grux. 



(Ji.EvE A Treatise on the Pliytop-lankton PI. II fig. 23.) 



1S98 March: 7" N. 55- W. 

 June: 10- N. 53' W. 



