4-0 Wille, Die Schizophyceen. 



Trichodesmium Thiebautii Goinont 



1897 December and 



1898 January: 7° N. 22° W. to 0" N. 26" W.; 13° — 15° S. 25° — 37° W,; 31° N. 39° W. 



to 11° N. 52° W.; Oaribean Sea; 25°— 35° N. 74° W. 

 February: 5° S. 4° — 9°E.; 4° S. 10" W.; Oaribean Sea; 21" — 34" N. 74°— 73° W. 

 Marcb: 0° 30' S. 15° — 26" W. to 31° N. 29° W. and thence to 9° N. 53° — 59° W.; 



23° W.; Oaribean Sea; 28° — 32° N. 74° W. 

 April: 15°N. 49°W. to 10°N. 53°W.; Oaribean Sea; 23"N. 72"W. to 27°N. 75°W. 

 May; area between 26" N. 42° W., 28° N. 47° W., 16° N. 71" W. and 11" N. 52° W.; 



41° N. 51" W. 

 June: area between 19" N. 63°-W.; 31" N. 50" W, and 19° N. 63" W. 

 July: 26" TS. 48" W. to 15" N. 72° W.; 29" N. 74" W. to 38" N. 74° W. and 



thence to 42" N. 48" W. 

 August: 17° N. 71" W. to 38" N. 74° W. and thence to 47° N. 39" W. 

 September; Cape Verde Islands, Madeira; 26" N. 39" W. to 9° TS. 53" W.; 20° N. 



73" W. to 38° TS. 74" W. and thence to 42° N. 57" W. 

 Oktober: 16"N. 70" W. to 34° N. 74°W.; 57° — 59° N. 27° — 21° W., rare. 

 November: 9" S. 34" W. to the Oanaries; Azores to 19° N. 58° W. 

 December: 26° S. 45" W. to 14" S. 39" W.; Oanaries; 25°N. 52° W. to 19° N. 



58" W.; Oaribean Sea. 



1899 January: 33° — 34 N. 15" — 12" W. 

 February: 32° N. 47° W. 

 March: 18°— 24° N. 45°— -40°W. 

 April: 28° — 32" N. 75° W. 



June: 5° — 7° N. 24" — 25" W.; 15"N. 50°W.; to 24° N. 42" W. 



July: 23" — 28° N. 36" — 40" W. 



Tem peratur e: 24,5; mean of 154 obs., max. 28,4 min. 13. 



Salin ity: 35,46; mean of 120 obs., max. 38,54 min. 33,20. 



Plankton -type. Occurs in the Mediterranean (Schröder). The area of distribution 

 in the whole tropical and subtropical Atlantic, on the Northern liemisphere to the left of a 

 line drawn from the Oanaries to Newfoundland. It occurs the whole year in the warm current 

 north of S. America and in the Sargasso Sea, appears, althongh sparingly, in May north 

 of 40° N., but reaches in August a maximum between 40" — 45° TS., where it remains 

 sparingly in October. In the last named month some rare specimena had drifted nearly to 

 60° N. — D.« 



In einigen in den letzten Jahren von Oleve herausgegebenen Arbeiten werden des 

 weiteren einige wenige Fundstellen für Planktonschizophyceen angegeben, nämlich (19, S. 12): 



