OINOFLAGELLAT^ — CERATIU.M 



CERATIUM GRAVIDUM Gourret.' 

 (SciiCtt: D. Peridineen d. Plankton-exp. PI. XI. fig. 81.) 



1897 Dcrciribrr: between 25° N. 50" W., 23° N. 51° W. and 2.S^\. 



42^ W.; Caribbean Sea; Azores. 



1898 January: Caribbean Sea; Florida Current to 35° N. 7-i- W.; 



11° N. 20° W.; 24° N. 17^" W.; Azores. 

 February: 5° S. 0°— 9° E.; 27°— 28° N. 41°— 39° W.; 21° N. 



50° W. to 18° N. 76° W.; whole Caribbean Sea; N. Of the 



Bahamas. 

 March: 4° S. 10" W.; 23° N. 28° W.; Caribbean Sea; 29°— 



Sr- N. 45°-42° W.; 43° N. 41° W.; 41° N. 23° W. 

 April: 19°— 16° N. 52°— 56° W.; Caribbean Sea; 31° N. 75" W. 

 June: 10° N. 52° W.; i2° N. 48° W. 

 September: 40° N. 65° W. to 46° N. 39° W. 

 October: Azores. 



Xovember: Azores'; 22" N. 53° W. 

 December: 26° S. 45° W.; 2.5° N. 52° W.; Caribbean Sea; 



Azores. 



1899 February: 32° N. 47° W. 

 March: Azores. 



April: 32° N. 75° W. 

 June: 12° S. 8° W 

 November: 49° N. 50" W. 



Temperature: 22. i, mean of 34 obs., max. 27.8, min. 12. 



Salinity: 35.99, mean of 21 obs., max. 37.4i, min. 33.93. 



Plankton-type. This species occurs in the Mediterranean and 

 the Indian Ocean. In the Atlantic it follows the Equatorial Current 

 into the Caribbean Sea and thence the Florida Current. It occurs 

 in September between 40° and 45° N. in the western Atlantic and 

 from December to March at the Azores and in the Sargasso Sea. 

 — 1). 



' Murray's & Whitting's data used. 



