P. T. Cr,EVE, PLANKTON-iiESEARCHES. 



Report on the Plankton in 1901 and 1902. 



January 1901. 



At Måseskär were collected two sainples, one in the beginning and one at the end 

 of the raonth, ;it Väderöboda four in the course of the whole rnonth. The samples were, 

 as regards bulk, small, but rich in forms. Not less than 81 were noted. Most characteri- 

 stic were Halosphcera and Ceratium longipes. 



The forras noted can be classified as follows 



Remiiants from ., rn . , 



-n v. inA,, ->Gw. To al. 



December 190(1. 



Southern oceanic . 14 5 ( .o 



Southern neritic 18 6 1 



Northern oceanie 12 2 ( oo 



Northern neritic 18 6l 



February 1901. 



No sample was collected at Måseskär, l)ut at Väderöboda in the beginning and at 

 the end of the nionth. The plankton was sca.rce and poorer in species than in January. 

 The forms noted can be classified as follows 



Remnants from „ n, . , 



T New. lotal. 



Januarj'. 



Southern oceanic 12 1( ..o 



Southern neritic b I 



Northern oceanic 10 1 ( ^r. 



Northern neritic 15 J 



There seems thus to have been a considerable reduction, which result must in part 

 depend on comparati^ely few samples having been collected in Februaiy. On the other 

 hand the plankton contained scarcely any other forms than such as occurred in January. 

 As no change of water arrived in February we may combine the data for the two months. 

 We thus get the following result 



Remnauts from 



December. ^^^ 



Southern oceanic 14 6 



Southern neritic 18 6 



Northern oceanic 12 2 i nn 



Northern neritic 18 7 



