•■>'•(' UIATO.MACK-K — fllLliTdCKIIDS 



CHiETOCEROS LORENZIANUS (Iran 



(Hi., a Treatise on the Pliyto-plankton PI. I fig. 13— l.o). 



lSi)7 Dccciiiher and 



ISUS Jannni'y: \i —1^) X. IS W.;- A/ores; \\' X. 17^ W.; (i X. 

 no- W. to 10 N. 15 W.; (Caribbean Sea; 25 --IJf) X. 

 71° W. 



Fohruary: IH X^ 70" W. to HI" X. 71- \V. 



March: 21—25" X. 18"-1()- W.; Azores; 11 X. 21—23- 

 W.; 19- N. 18° and HH- W.; 7"— 1(1" X. 55 — oH' W.; Carib- 

 bean Sea; 2H- X. 71 W.; 1() N. (il-- W. 



April: Azores; 19 N. H8" W. to 50 X. 9 W.; 7—10- X. 

 55" — 58" W.; Caribbean Sea; 12" X^. 17" \V. 



Muij: Caribbean Sea; 20- X. HO W. 



July: Caribbean Sea. 



Anijii^t and Scjitcmhc/-: Azores; Caribbean Sea. 



October: Caribbean Sea; 12" X. (il" \V. 



Xor ember: Azores. 



l)ccciiiJ)cr: Azores; IS- X. (17 \\'. 

 1S99 Jannnry: 8.5" X. 15" W. 



February: 82— 81" X. 17 — 10- W. 



March: 17"— 1-9" X. 8°— 9" W. 



A]>nl: \\r N. 18" W. to 19" X. 7" W.; 32' X. 75 W. 



Temperature: 19.4, mean of i3 obs., max. 28.4, min. 11. 



Salinity: 35.72, ..mean of 29 obs., max. 8().iic,, min. 31-.tii. 



Plankton- type. This species occurs in tlie tropical qnd tempe- 

 rate Atlantic, round the Sargasso Sea, has in the spring the same 

 distribution as the Styli-plankton in general, but reaches scarcely 

 beyond 50° N. Although of frequent occi,irrence in the Desmo- 

 plankton of the western Atlanti<!, it must be considered as belonging 

 to the Styli-plankton. Occurs in the Mediterranean, Red Sea and 

 Indian Ocean. — N. 



