ÖFVERSIGT AF K. VETENSK.-AKAD. FÖRHANDLINGAR 1899, N:0 9. 869 



Coseinodiscus (Planktoniella) Sol Wallich. ^) 



1898 January. Cape Verde. From 33' N. 31' W. to 46' 

 N. 11° W. — The South Equatorial current at 0° 5' S. 29' 10' 

 W. and 7'— 11' N. 53'— 52' W. — The Florida current, 35' 

 N. 74' W. 



March. The South Equatorial current, O' 40'— O' 30' S. 

 15 _26' W. At 10' N. 53' W. — The Florida current, 32' 

 N. 74' W. Not rare on the space between the Azores, the 

 mouth of the English Channel and 49' N. 33° W. 



April. The Florida current, 31' N. 75' W. The space 

 between the Azores, the English Channel and 47' N, 40° W. 



May. At 41' N. 59' W. The space between 43' N. 45' 

 W., 50' N. 14' W., Cape Finisterre and 41° N. 16° W. (most 

 common north of 45' N.). 



Ju ne. Rare at 46'— 50° N. 12' W. 



September. Rare at 59' N. 21'— 16' W. 



October. Rare at 57' N. 18' W. 



November. Soutli Equatorial current. O' 21' S. 31' 23' W. 

 The space between 48' N. 41' W., 56' N. 23' W., 55' N. 21' 

 W. and 48' N. 29' W. 



In May and June, 1899, this species was coUected by the 

 Dutch Fregatte Atjeh west of South Africa from 32° S. 13° E, 

 to 15' S. 5° W. 



The range of distribution of this species, eminently adapted for 

 drift with the currents, is thus from the Cape of Good Hope to 

 Cape Verde, between the Azores and the European coast at least 

 to 59' N. It follows besides the South Equatorial current to 

 S. America and the Florida current, at least to 35° N., but 

 it is rauch rarer in the west than in the east. If the eastern 

 area of distribution be considered, it will be seen that it prevails 

 in March and April in the space between the Azores and the 

 English Channel, and goes in May north of 45' N. Låter it is 

 rare or absent in that region. In November it appears again 



') Osten feld's data used. 



Öfvers. af K. Vet.-Akad. Förh. 1899. Arg. 56. N:o 9. 2 



