18 



P. T. CLEVE, PLANKTON-RESEARCHES. 



July 1902. 



In July collections were made throughout the month at Väderöboda aud Måseskär, 

 and,' besides, an excursion with the government Steamer »Skäggald» was made to the 

 central part oi the Skagerak and to the Kosterfjord (Ramsö). The forras noted at the 

 two stations Måseskär and Väderöboda can be classified in the following manner: 



Remnants from 



June. N*^^- ^ot"'- 



Southern oceanic 9 8 | ^^^ 



Southern neritic 4 5 1 



Northern oceanic y 3 1 ^a 



Northern neritic 7 1 J 



The plankton was of about the same kind as in June, Rhizosolenia gmcillima and 

 triijos-plankton predominating. 



The plankton in the central Skagerak contained exclusively animal organisms, in the 

 deeper layers chiefly arctic species. How far from the surface this arctic fauna commenced 

 could not be ascertained, as the townetting failed betM-een 50 and 200 m. The following 

 lists shoAv the nature of the plankton in the fjords and in the central Skagerak in July. 



Plankton coUected in July 1902 in the fjords of Sweden. 



Place 



Depth 



Fritillaria borealis . . 

 Oiko[ileura dioiea . . 

 Evadne Nordinani . . 

 Podon Leuckarti . . . 

 Acartia Clausii .... 

 A. longiremis .... 

 AnomaloL-era Patersoni 

 Calanus finmarcbicus . 

 Centropages hamatus . 



C. typicus 



Isias clavipes .... 

 Metridia lacens . . . 

 Oithona plumifera . . 



0. similis 



Paracalanus parvus . . 

 Pseudocalanus elongatus 

 Tcmora longicornis . . 

 Margelis principis . . 

 Pleurobrachia pfleus 



Ramsö. 



Ramsö. 



Hafsten- 

 simd. 



Gullmarcu 

 »Tresholdi. 



Gullmaren 

 »Tresholds. 



Gullmaren 

 Alsbäck. 



Gullmaren 

 Alsbäck. 



Gullmavcn 

 Alsbäck. 



200-0 



10-0 



40-0 m. 



50—0 m. 



100—0 





r 





— 



+ 



— 



c 



+ 



c 



— 



r 



r 



r 



+ 



c 



00 



r 



+ 



— 



— 



r 



+ 



r 

 r 



r 



— 



r 



r 



rr 



+ 



— 



+ 



— 



+ 



c 

 r 

 r 



r 



+ 

 + 



+ 



+ 



c 



+ 



1 



