38 P. T. CLEVE, PLANKTON-RESEARCHES. 



+ + C. M. + cc. Norw. 61° N. 3°— 5° c and 68° N. 8°— 13° E. + c. Jiine, M. + c. July, 

 M. ccr. August, the North Sea common and as C. macroceros. Skagen common every- 

 where. Septembe7\ V. e. M. ccc. October, V. ccc. M. ccc. November, extremely abun- 

 dant in the area between 58° N. 1° E., Newcastle and Skagen, less common E. and S.E. 

 of Dogger bank. V. ccc. M. +. .December, V. ccc. M. + cc. R.Sg. c. Nh. c. 



1902 January, V. c. M. c. February, common from 58° N. to the Dogger bank 

 and S. Norway, else sparingly in the whole North Sea. Skagerak as C. macroceros. April, 

 M. or. V. or +. May, area between 58° N. 2° E., Newcastle and Skagen, most common 

 north of Jutland. M. + cc. N. rcc. June, M. c. V. ccc. July, M. ccc. V. ccc. The 

 fjords + to c. — Tp. S. 



Dinophysis acnta Eheenberg. — 1901 .Tanuary, V. roo; M. ro. February, Norw. 63° 

 — 64°N. 0°— 5°E. r; 68° N. 13°— 14° E. r. March, Norw. 74° N. 20° E. 'r. April, V. 

 oro. M. oor. Norw. 69° N. 14°— 18°E. r. May, V. oro. M. orr. Norw. 61° N. 5° E. r 

 and 68° N. 8°— 13°E. r. .June, M. r. August, from the Orkneys and Firth of Forth to 

 S. Norway and Jutland. Skagerak sparingly everywhere. September, M. rrr. October, V. 

 rrr. M. ror. November, northern North Sea in tripos-plankton, in some spöts common. 

 V. rrr. M. r. December, V. rro. M. rrr. R.Sg. r. Nh. r. 



1902 Ja7iuary, V. r. M. r. February, area between 58° N. 0° E., Firth of Forth, 

 54° N. 4° E. and W. Jutland, always sparingly. Skagerak along the coast rare. April, 

 M. rr. May, area between 56° N.0° — 7° E., as a rule sparingly; /■ at 52° N. 4° E. M. orr. 

 V. oro. June, M. r. V. roo. July, M. roo. V. roo. — T. Ns. Tp. (boreal, not arctic). 



Dinophysis granulata Cleve. — 1901 January, V. roo. May, V. rrr. August, r at 

 58°50' N. 10°15' E. M. r. November, sparingly in the triposplankton of the northern 

 North Sea. V. rro. M. r. December, V. roo. M. roo. 



1902 May, r at 58° N. 6° E., not rare at 55°— 56° N. 7° E. — T., Tp. 



Dinophysis hoimmculus Stein. — 1901 November, at some spöts between Scotland 

 and Skagerak, r. December, R.Sg. r. — ;S (southern species). 



Dinophysis norvegica Jörgensen. — 1901 May, Norw. 61° N. 5° E. r, 68° N. 13° 



E. r. August, Skagen r, Koster in 40 m. r. 



1902 April, Y. oor. May, M. rro. June, V. roo. July, M. ror. — T (boreal, 

 scarcely specifically distinct from D. acuta) Tp. 



Dinophysis rotundata Stein. — 1901 January, V. roo. May, V. rro. M. ror. Atl. 

 63° N. 2° W. r; 68° N. 6° E. r. June, M. vt. August, sparingly from the Scheldt to 

 Skagen and S. Norway; from Skagen to the central Skagerak and M. October, V. rrr. 

 November, V. rro. M. r. December, V. rro. M. roo. 



1902 February, sparingly from 56° N. 0° E. to S. Norway and W. Jutland. April, 

 M. or. V. oor. May, sparingly in the area 55° N. 1° W. and 57°— 58° N. 8° E. June, 

 M. r. July, M. ror. — T. Ns. Tp. 



