hlATOMACI .1 i;lll/.<iS(»I,KMA 'M\ 



Temperature: lo.?, moan of 2iS obs., max. 27.,;, min. 7. 

 Salinity: ;>;")..■.,,, mean of 24 obs., max. HO.m, min. 32.!..;. 

 Plankton-type. Occurs in plankton from Jedo Bay, Japan. — N. 



RHIZOSOLENIA CYLINDRUS Ci..' 

 (A Treatise on the I'liyt.i plankltm I'l. 11 li^r. 12). 



1897 hi'cciiihcr: and 



1898 Jafiiiarij: 12'^ N. 50 \V.; Caribbean Sea; 2b N. li W. 

 FcbriKiry. Caribbean Sea. 



March: 3^ N. 2i W. 

 April: 10" N. 53" W. 

 Moji: Caribbean Sea; 11" N. 5<)" \V, 

 Juki: 24^ N. 54- W.; 10" N. 67^—58 W. 

 Aiujiist: 40^ N. 66^ W. to 42^ N. 50" W. 

 Srpfciiihcr: 9" N. 53" W.; Caribbean Sea. 

 Ortohi'r: Caribbean Sea; 34'^ N. 71' W. 

 Ih'ci'iiihcr: (Caribbean Sea. 



Temperature: 25. a, mean of 20 obs., max. 28. i. min. \\).i^. 



Salinity: 34.!»5. mean of 13 obs., max. 3H.hs, min. 33. ^o. 



Plankton-type. This species lias been seen once in the (Ininea 

 Current; else' it seems confined to the sea along tiie nortli coast of 

 South America, the Caribbean Sea and Florida Current. In .luly. 

 August it follows the Desmo-plankton between 67"— 50' W. beyond 

 40" N. The low mean salinity indicates it as a more neritic than 

 oceanic form. Schkoder mentions it from Naples. — Xt >of the 

 western Atlantic). 



RHIZOSOLENIA DELICATULA c,,.. 

 ;Kongl. Sv. Vet. Aka.l. llaiidl. Vnl. XXXII ii. S pag. 28). 



S'.is Mii/-rli: .58 N. 6' K. 

 Aiitjiist : Azores. 



Temperature: ') t.. 2:1.7. 



Ostenfflfl's (lata not used. 



