.141 



1'. T. CLEVE, PLANKTON-HESEAKCllES. 



Remnauts from 

 September. 



Southern oceanic 15 



Southern neritic ........ 15 



Northern oceanic 7 



Northern neritic 10 



New. 



9 



7, 

 9 

 10 



Total. 

 46 

 36 



November 1901. 



During this month four samples were collected throughout the month at Måseskär 

 but one only, in the beginning of the month, at Väderöboda. The samples were exceed- 

 ingly rich in forms, which can be classified as follows. 



Remnauts from ^^ ^ 



October. ^*^^^'- Total. 



Southern oceanic 23 O I ,„ 



Southern neritic 19 5) 



Northern oceanic 12 5| .. 



( 44 



Northern neritic . 19 8 ) 



The plankton consisted chiefly of southern and northern neritic forms and some 

 tripos-plankton. 



The North Sea was also explored during November and the result from a corabined 

 hydrographic and biological point of wiew has been published in another paper. 



In order to see how far the plankton of the North Sea had been changed since 

 the last expedition in August I have made the following statistics. 



Forms fouud in Forms found in Forms found in 



August only. August and November. November only. 



Southern oceanic 3 19 7 



Southern neritic 7 19 6 



Northern oceanic 1 19 7 



Northern neritic 8 11 16 



There had thus been since August some increase in the number of northern, 

 expecially neritic forms. 



December 1901. 



Both at Måseskär and Väderöboda samples were collected throughout the month, 

 samples were also collected during a cruise from Gullmarefjord to Smögen and Ramsö 

 and to Norsholm Ligthhouse. The plankton was, as usual at this time of the year quanti- 

 tatively poor, but very rich in number of forms, which have been classified as follows. 



