26 P. T. CLEVE. THE PLANKTON OF THE NORTH SEA, THE ENGLISH CHANNEL, AND THE SKAGERAK. 



W. of Jutland. — B. In the E. Channel at Plymouth rare in Februaiy, March, abundant 

 in Jidy, August and in November. At S:t Vaast la Hogue rare in August. — C. At 

 Helder rare from the end of September to the end of October. — D. In the Skagerak 

 rare in January, common from October to the middle of November (maximum in the 

 beginning of November) or along the coast from the end of August (maximum in 

 Septetnbe7'). 



C. scolopendra Cl. — In March rai'e SW. of Norway and mid- 

 way between Skagen and Scotland. — At Helder rare at the end 

 of September. In the Skagerak rare from January to April and in 

 November. 



The annexed fig. 10 represents the endocyst, 1000 t. m. 



C. seiracanthus Gran. — Rare in the Skagerak, at the end of October. 



C. septentrionalis Oestr. — Rare in the Skagerak in March. 



C. similis Cl. — Rare in the Skagerak in March and in November. 



C. socialis Lauder. — Rare from January to March in the 

 Skagerak, in March on the Fisher Bank. 



Pig. 10. 



C. subtilis Cl. — Rare in March in the Skagerak. 



C. teres Cl. — In the North Sea rare in March SW. of Norway, at Skagen, on 

 the Fisher Bank and at 56°34'N. 2° 20' E. — At S:t Vaast la Hogue rare in June 

 (appeared again in January 1899). — In the Skagerak from January to March and in 

 November, usually rare. 



C. Weissflogii Schutt. 

 month common at Måseskär. 



In the Skagerak in September, on the 3rd of that 



C. Villei Gran. — Rare in June at Helder. 



Corethron hystrix Hensen. — Rare in June W. of Cape Stadt. 



Coscinodiscus concinmis W. Sm. — A. In the North Sea found abundantly in March 

 from Skagen along the Danish coast to 55° N. More or less sparingly from the Danish 

 Peninsula, along 56° N., towards Edinburgh and Nevvcastle. June to August rare in 

 some spöts. In November common from the E. Channel to Skagen and from Skagen along 

 56° — 57° N. to 4° E. ■ — B. In the E. Channel at Plymouth common from January to May 

 and from the end of September to the middle of December. — C. At Helder rare in 

 January, February, more or less common from the end of September to the end of 

 December. — D. In the Skagerak more or less sparingly from January to March and 

 from the end of August to December (maximum in December). 



