28 P. T. CLEVE. THE PLANKTON OF THE NORTH SEA, ENGLISH CHANNEL ETC. 



C. polychordus Gran. — Arctic species, which was found in July 1898 S. of Ice- 

 land and in October at the Färöes. 



February: W. of Schleswig r; Skagerak and Måseskär r; S. of Norway r. Marek: 

 Skagerak and Måseskär + r. April, May: NE. of Scotland c; 56° N. 6° E. r. November, 

 December: Skagerak, Väderö and Måseskär r. 



C. radiatus Ehb. — January: Väderö and Måseskär r. February: round Scotland, 

 thenee to S. Norway, Skagen and the Danish W. coast; Väderö rr; St Vaast r. Marek: 

 N. of Scotland r; Plym. +. April, May: British E. and W. coasts; Danish coast; Måse- 

 skär r. June: Skagerak rr. August: Irish Sea r. September; Skagerak rr. November: 

 Irish Sea + c; round Scotland; off the Dutch coast; W. of J utland; Skagerak r. 



C. stellaris Roper. — February: W. of Jutland r. Marek: Skagerak r. June: 59° N. 

 5° E. r. November: rare above the Fisher liank; Måseskär r. December: Måseskär r. 



Ditylum Briffhtwellii West. — January: St Vaast + c; Helder r; Måseskär +. 

 February: St Vaast + r; Helder rr; along the W. coast of Denmark to Skagen r; S. Nor- 

 way r. Marek: Plym. r +; St Vaast r; Helder +. April, May: N. and E. of Scotland r; 

 Plym. + r; Helder r; along the W. coast of Jutland to Skagen cc. July: Plym. r; Skagen r. 

 August: Plym. r. September: Skagerak r. October: Skagerak, Väderö and Måseskär r. 

 November: Plym. r; Irish Sea r; banks W. of Denmark c; Skagerak +cr; SW. of Norway r. 

 December: Väderö and Måseskär r. 



Eucampia zodiacus Ehb. — January, February: St Vaast r. Marek: St Vaast r; 

 Helder r +. April: Helder c; 56° N. 6° E. cc; Måseskär +. September: Helder v. October: 

 Plym. re. November: W. of Jutland rr; Skagerak + r. 



Guinardia flaccida Castr. — February: off the Dutch coast rr. Marek: Plym. +; 

 Helder c. April, May: Plym. ccr; Helder c; W. of Denmark r; from 56° N. 1° and 6° E. 

 to Skagen cc. June: Plym. r; Helder +; Skagerak + r. July: Helder c. August: E. of 

 Scotland r. September: Plym. +; Skagerak + r. October: Plym. er; Skagerak +. November: 

 Irish Sea +; F. of Newcastle and in the central Noi'th Sea r; rather common above the 

 whole 50-metre plateau of the North Sea; Skagerak + r; Måseskär r. December: \'äderö 

 and Måseskär r. 



Lauderia annulata Cl. — Marek: Skagerak rr. April, May: Plym. +; more or less 

 common round Scotland and thence to the Danish Peninsula; Måseskär c; Väderö r. 

 October: Plym. r. November: Irish Sea r; Skagerak r. December: Måseskär r. 



Leptocylradrns danicus Cl. — February: Måseskär r. March: Skagerak and Måse- 

 skär r. April, May: Plym. r; sparingly N. of Scotland; common S. of Norway (58° N. 

 4°— 7° E.), but rare at 59° N. 2°E.; common at 55° N. 6°E.; rare above the Fisher Bank; 

 Maseskär r. June: Väderö r. 



