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



D. Vanhöifenii Ostenf. — July, August: E. of Scotland r; Skagerak r. September: 

 Skagerak r. 



Diplopsalis lenticula Bergh. — February: ö8° N. 4° E. r; some spöts between New- 

 castle and Skagen r. July, August: Plym. r; E. and W. of Scotland r; W. Skagerak r. 

 September: Skagerak rr. October: Måseskär rr. November: Plym. r; off the Dutch coast r; 

 Skagerak rr. December: Plym. r. 



Gonyaulax polyedra Stein. — September: Skagerak rr, 



G. spinifera Clap. & Lachm. February: W. of Schleswig r; between Skagen and 

 S. Norway r. March: Väderö rr. April, Mag: between Scotland, Newcastle and the 

 Skagerak r; 55° N. 6° E. r. July, August: W. of Schleswig r; Skagerak rr. November: 

 Måseskär rr. 



Peridininm depressum Bail. — January: Väderö and Maseskär r. Februarg: E. of 



Scotland r; W. of Jutland r. March: Skagerak ccr. April, May: W. of Scotland; from 

 ii()°N. 1°E. to 58° N. 4°E. c; between Newcastle, S. Norway and Jutland + ; 55° N. 

 G°E. c; Väderö and Måseskär ccr. June: 62° N. 5° E. r; Väderö +. July, August: 56° N. 

 0° 30' W. c; between Firth of Tay and Skagerak r; W. Skagerak + r. September: Väderö r. 

 October: Plym. + r. November: Plym. + r; Irish Sea r; between Scotland and Skagerak r; 

 Måseskär and Väderö r. December: Plym. r; Maseskär r. 



P. ftfrergens Ehb. — January: Skagerak rr. Februarg: between Newcastle and 

 Skagerak, as a rule r. April, Mag: 58° N. 5° E. and 59° N. 2° E. rr. June: 60° N. 5° E. r; 

 58° N. 7° E. r; Skagerak r. July, August: Plym. + r; Irish Channel r\ E. of the Shetlands 

 and at 57° N. 1°' — 6° E. r; Skagerak r. September: Skagerak c r (maxim.). November: 

 Irish Sea r; between Scotland and the Skagerak r; Skagerak r. 



P. exiguum Cl. (K. Sv. Vet, Akad. Hand!., XXXIV, N:o 1, p. 17, FL VIII, f. 5). — 

 August: Plym. rr. 



P. Michaelis Ehb. — April, May: 57° N. ,8°E. r. August: Plym. rr. September: 

 58° N. 7°E. v, Skagerak rr. 



P. oceanicum Vanhöffen. — July: off Heligoland c; E. of Scotland r; N. of Jutland r. 



P. ovatum PouCHET. — February: S. of Norway r; W. of Schleswig r. March: 



Plym. r; N. of Scotland v. April, Mag: Plym. r; Helder r; \\. of Scotland r; between 



Firth of Tay, Newcastle and Skagerak c. September: S. of Norway r. October: Plym. r. 

 November: Plym. r. 



P. pallidura Ostf. — July: 58° N. 0° E. r. September: Skagerak rr. November: 

 Irish Sea /■; E. of Jutland r. 



