30 P. T. CLEVE. THE PLANKTON OF THE NORTH SEA AND THE SKAGEEAK. 



€. septentrionalis 0stk. — December: V. r. 



C. similis Cl. — January: central Skagerak r. February: M. -)-, V. c. March: V. r. 



C. sodalis Länder. — February: V. c. March: comraon at 56° 33 N. 12°16'E., 

 Middelgrundet; Vinga; M. -f~) V. cc. November: N. of Jutland jr. 



C. teres Cl. — January: central Skagerak r, V. r. February: M. rr. March: from 

 56°33'N. 12°16'E. to M. not rare. April: W. of Schleswig +; Skagerak r, M. r. May: 

 M. r. December: M. and V. rr. 



Cosciuodisciis ceutralis Ehb. — November: W. of Scotland r, Skagerak r. 



C. conciumis W. Sm. — January: central Skagerak and from Vinga to Väderö r. 

 Febniary: W. of Scotland +; area between 58° N. 3° E., 56° N. 2° E. and Sk., more or 

 less rare; M. r. March: Vinga, M. r. April: area between 55° N. 6° E., 56°— 57°N. 2° 

 — 3° E. and Sk. most common along the Danish coast; Skagerak r, V. cc. MaynndJune: 

 M. and V. cc. October: M. and V. -j-. November: off the Dutch coast r; W. and N. of 

 Jutland r; M. r, V. -|- r. December: V. -f-. 



C. exceiitriciis Ehb. — February: common W. of Scotland; not comraon from 59° 

 N. 0°E. to Sk. October: V. +. November: W. and N. of Scotland r; Holland to Sk. r; 

 Vinga (30 ra.) +, M. rr, V. + ?-. December: V. +. 



C. lacnstris W. Sm. — March: Vinga r. 



C. lineatus Ehb. — December: V. r. 



C. oculus iritlis Ehb. — January: Vinga and M. r. February: sparingly along the 

 50 metre plateau of the bottora of the North Sea; M. r. March: M. r. April: E. of 

 Scotland; N.W. of Jutland r. June and July: the Shetlands r. November: central North 

 Sea rr, N. of Jutland rr, V. r. December: V. r. 



C. (Cosciiiosira) polychordus Gran. — January: central Skagerak r, M. r, Gullraars- 

 fjord r. February: 57° N. 8° E. r, M. c. March: Kattegatt (Middelgrundet) +; 56° 33' N. 

 12°16'E. r, M. r. October: M. r. November: N. of Jutland r, M. and V. r. December: 

 M. and V. r. 



C. radiatus Ehb. — January: central Skagerak r. February: as C. excentricus- 

 April: E. of Scotland c, thence rarer to tho west coast of Jutland. October: M. and V. 

 r. November: W. of Scotland and from Holland to Sk.; N. of the Fisher Bank, M. and 

 V. /". December: M. and V. rr. 



C. stellaris Ropek. — January: Dröbak (30 m.) +. February: 58° N. 3° E. r. 

 March: Vinga v. October: V. r. November: V. and M. rr. December: V. rr. 



