218 DINOFLAGELLAT/F. — CERATIUM 



Plankton-type. The area of distribution is the whole tropical 

 and subtropical Atlantic, between Africa and South America, It has 

 been seen in 1898 May and July only very rarely north of 40° N., 

 but in August it passed beyond that limit to at least 45° N. In 

 September to January it occurred between the Azores, Gibraltar and 

 the (lanaries. — I). 



CERATIUM FURCA Di j.^ 



(Stein; D. Org. d. Infusionsth. PI. XV W 7—14.) 



1897 iJercmbcr and 



1898 Januani: 12—21^ N. 19°— ]7° W.; 4° N. 30° W. to 13° S. 



35° W.; Caribbean Sea; 25° N. 50° W. 



February: 21°— 27° N. 41°— 51° W.; Caribbean Sea. 



March: 4° S. 10° W.; 3° N. 16° W.; 14°— 25° N. 17°-18°W.; 

 29° N. 42° W.; 1' N. 55° W.; Caribbean Sea. 



April: 39° N. 24° W.; 59° N. 22° W.; north of Scotland. 



May: 16°— 24° N. 58°— 51° W.; area between 44° N. 19° W., 

 48° N. 29° W. and 50° N. 12° W.; 59°— 57° N. 28°— 25° W. 

 to the Fiiroe Channel; Shetlands to 58° N. 5° E. and 66° 

 N. 9° E. 



June: 34° N. 46° W, and 57" N. 34° W., rare; area between 

 40° N. 10° W., 42° N. 33° W. and 47" N. 17° W., maximum 

 at 45° N. 23° W.; N. of Scotland (common on some spots) 

 to SE. Iceland to the west coast of Norway, from 61° to 

 68° N. 



July: common at 39° N. 23° W., more or less rare at 49° N. 

 22° — 10" W.; common on the area between the Faroes, Scot- 

 land and the Shetlands, thence less common to 58° N. 32° 

 W. and sparingly to 59 N. 2° E. 



August: 49° N. 24°— 12° W.; 56° N. 34°— 28° W.; 40°— 41° 

 N. 59°. W.; Irish Sea and the Clyde area; common from the 

 Shetlands to the Faroes and thence with decreasing abun- 

 dancy to Iceland and round that island; 60° N. 3° E., rare, 



September: 45°— 49° N. 14° W. to 49° N. 3° W.; SW. and N, 

 of Kockall, 56° N. 19° W. and 57° N. 14° W.; common N. 



' Ostenfeld's, Murray^s & Whittincj's data used. 



