12 P. T. CLEVE. ' PLANKTON, COLLECTED BY THE SWEDISH EXPEDITION TO SPITZBEKGEN. 



7. King' Charles Land. Round Spitzbergen. North west of Spitzbergen. 



August 13th. August 25th. 



Temperature — 0,58 to -[-3,44. Salinity about 33 p. m. 



The plankton is constituted by chaäto-, tricho- and arctic neritic plankton. 



The following were the most important: 



Chfetopl. 



Chcetoceros horealis -\-, 

 C. criopkilus r, 

 C. decipiens -\-, 

 Phceocystis Pouchetii ?'. 



Arctic neritic plankton. 

 Cyttarocylis dentic. v. obtusa c, 

 Fungella arctica r, 

 Ptychocylis obtusa c, 

 Dinohryum c, 

 Peridinium pellucidum -\-. 



Trichopl. 

 Calanus finviarchicus r, 

 Fritillaria horealis r, 

 Cyttarocylis denticulata r, 



v. gigantea c, 



v. media r, 

 Tintinnus horealis r, 

 Ceratium arcticum c, 

 Chcetoceros atlanticus r, 

 C. boreal. v. Brightwellii r, 

 C. criophilus r, 

 Coscinodiscus oculus iridis rr, 

 Rhizosolenia ohtusa r, 

 Thalassiosira gravida r. 



Besides these species were found Oithona similis, common in some gatherings, and 

 the following of the northern neritic plankton: Ceratium (tripos v.) longipes r, Chcetoceros 

 diadema r, Leptocylindrus danicus r. 



8. West of Spitzbergen— Beeren Eiland. 



August 28th to September 4th. 



Temperature 5,34 to 7,24. Salinity about 35. 



The plankton is composed of styliplankton, usually predominant, and trichoplankton. 

 The most important forms are: 



Styliplankton. 



Microsetella atlantica r, 

 Oithona similis c, 

 Onccea minuta -\-, 

 Glohigerina bulloides r, 

 Challengeria tr idens r, 

 Litholophus liguriniis r, 

 Chcetoceros horealis v. solitaria -\-, 

 C. volans cc, 

 Corethron hystrix r, 

 Rhizosolenia alata r, 



Trichoplankton. 



Calanus Jinmarchicus, 

 Fritillaria horealis, 

 Cyttarocylis denticulata r, 



var. media c, 



var. edentula -{-, 



var. gigantea r, 

 Ptychocylis acuta r, 

 Tintinnus secatiis r, 

 T, minutus r, 

 Ceratium tripos v. arctica r, 



