KONGL. SV. VET. AKADEMIENS HANDLlNGAi;. BAND 32. N:0 8. 19 



Silieoflagellata. 



Distephanus speculuni (Ehb). — Rare in Mardi at the Fisher Bank, in August at 

 Plymouth and in November in the E. Channel, at Helder and wcst of the Danish Peninsula. 

 Rare in the Skagerak in October and November. 



ChlorophyllaceaB. 



Halosphaera A'iridis Schmitz. — A. The North Sea: abundant in Mardi ft^om 

 63° N. 1° 30' E. to Stavanger, sparingly from Stavanger to Skagen and to Newcastle. 

 November: at the Hebrides. Between the N. of Scotland, Newcastle and Skagen. — 

 B. The E. Channel: rare in August and September at Plymouth. — G. The Skagerak: 

 in January, February and November, December. 



Diiioflagellatae. 



Ceratium furca Ddj. — North Sea: foUows as a rule C. tripos, but rarer. The 

 Skagerak: common in .January, more or less rare the whole year. 



C. fusus Duj. — North Sea: follows C. tinpos but rarer. The Skagerak: the whole 

 year, seems to be more abundant from August to the end of the year. — Plymouth: 

 the whole year, maximum in April. 



C. lineatum Ehb. The Skagerak: rare almost the whole year, maximum probably 

 from August to November. 



C. macroceros Ehb. — A. The North Sea. Mardi: more or less rare in the chasto 

 region from Scotland to Norway and Skagen. Jane: common W. of Skagen to half waj' 

 between Skagen and Newcastle. Not rare E. of Firth of Tay. July, August: very com- 

 mon W. of Skagen and the Danish Peninsula. November: very rare W. of Scotland, 

 common from the S. of the Orkneys towards Newcastle and to 53° N. 4' E., thence to 

 Skagen and S. Norway. — B. The Skagerak: more or less rare until July, låter 

 common until the end of the year. 



C. tripos NiTzscH. — A. The North Sea. Mardi: common in the eastern part, 

 SW. of Norway, W. of Skagen and the Danish Peninsula towards 55° N. Common also 

 at 53°26'N. 3°57'E. June: from Skagen to TE., between 56° 30' and 57°30'N. July, 

 August: from Skagen to 57° N. 4° E. and to 55°30'N. 7°30'E. (no observations from the 

 western North Sea). November: the whole North Sea from Scotland to Norway, Skagen 

 and to 53° N. 4° E. — B. The E. Channel: the whole year at Plymouth, maximum from 

 July to December. — C. The Skagerak: common in January, then v&Ye to June, common 

 from July to the end of the year. 



