798 P. T. CLEVE, SOME ATLANTIC PLANKTON-ORGANISMS. 



bergen, but the principal bulk of the plankton continues along 

 the east of Greenland towards the north of Iceland and sur- 

 rounds that island. From Iceland it advances on the east 

 to the Färöes and to the Shetlands towards the west of Norway 

 at about 62° N., and on the west through the Denmarks Sound 

 to the east of Greenland, turns round Cape Farwell and enters 

 Davis Strait, in raost cases to Disco, follows the Labrador 

 current above the Newfoundland banks along the east coast of 

 N. America to New York, Chesapeake or, rarely, somewhat farther 

 south. 



In the winter, frora November (in rare cases also in August 

 at the Azores) to the beginning of the summer some of these 

 species occur scattered over the whole Atlantic from the New- 

 foundland banks to the south of the Azores and to the coasts of 

 Portugal as well as to the mouth of the English Channel. This 

 fact does not seem to me to be explainable in any other way 

 than as due to the southgoing current along the coast of Ame- 

 rica continuing as an undercurrent to Europé. 



The seasonal distribution of some northern, but not 

 arctic plankton-organisms. 



The following species occur in the Skagerak more or less 

 intimately associated with the chceto- and tricho-plankton and 

 the northern neritic plankton, the last-named being partly derived 

 from these plankton-types. 



Evadne nordmannii Loven in 1898. 



April. The English Channel, 50° N. 2° 40' E. 



May. At 48° N. 26° "W. — In the Channel. — Common at the 

 Färöes. From the Shetlands to Norway, 58° — 60° N. 3° — 5° E. 



June. S. of Iceland. Färöes. W. of Norway (62° N. 

 2° 30' E.). 



July. W. and S. of Iceland. Along 59° from 5° to 23° W. 



August. S. of Iceland. Between Iceiand and the Färöes. 

 The Shetlands and the Orkneys. 



