KONGL. SV. VET. AKADEMIENS HANDLINGAR. HAND 34. N:<> 2. 27 



C. similis Cl. — Mardi: Skagerak rr. November: r. 



C. socialis Lauder. — Arctic species, which was found in -Inne 1898 abundanth 

 S. of Iceland. 



February: Väderö and Måseskär er. March: very common in tlie whole Skagerak. 

 August: Måseskär r. September: once very common at Måseskär. October: Plym. +. 

 November: Skagerak c r. 



C. suMilis <'l. — August: Måseskär r. 



C. teres Cl. -- Arctic species, found in August 1898 at the Färöes, in March 1899 

 N. of Iceland, in April at 4 ( J° N. 7° \Y\, in May at Vestmannaö (c), the Färöes (v) and at 

 61° N. 1°E. (r). 



February: St Vaast +; Helder rr; Väderö and Måseskär rr. March: Plym. + c; 

 St Vaast r: Helder r; Skagerak er. April, May: 58° N. 2 : E. r; 56° N. 1 E. r; Plym. +. 

 November: Skagerak, Väderö and Måseskär r. 



Corethron hystrix Hensen. — March: Plym. r. April, May: N. of Scotland r. 



Coscinodiscus concinmis W. Sm. — This species occurred abundanth' at the Färöes 

 from September 1898 to May 1899. 



January: Plym. r; St Vaast + r; Helder r; Väderö and Måseskär + c. February: 

 round Scotland r, thence more or less common to the Skagerak; St Vaast +; along the 

 W. coast of Denmark; Väderö and Måseskär cc. March: N. of Scotland ;•; Plym. c; 

 Skagerak rr; Måseskär c. April, May: rare at sorae points in the North Sea; Måseskär +. 

 .ful;/: off Heligoland r; Väderö, Måseskär and Gullmarfjord re. September: Plym. c; 

 Helder er; Skagerak r. October: Plym. c; Väderö +. November: Plym. c; Irish Sea r; 

 some points on the central North Sea r; round Jutland r; Skagerak r +. December: 

 Plym. c; Väderö +. 



C. excentricus Eiib. — This species occurred in November 1898 from 62° N. 8° W. 

 to 60° N. 4°W. 



January : St Vaast c. February: Plym. r c; St Vaast c; in the North Sea together 

 with C. concinnus. March: N. of Scotland r; Plym. cc +; Helder r. April: Helder r. 

 September: Skagerak r. November: Irish Sea c; W. of Schleswig c; Skagerak r. December: 

 Måseskär r. 



C. oculus iridis Ehb. — Arctic species, which was seen abundantly in November 

 1898 at Vestmanna ö and in February 1899 at the Färöes. 



January: Måseskär +. February: E. of Firth of Tay +; St Vaast rr; W. of Jut- 

 land c; S. of Norway r; Måseskär c. March: N. of Scotland r; Skagerak and Måse- 

 skär + r. April, May: central North Sea r; Skagerak r. November: Plym. +; Skagerak r. 

 December: Plym. +. 



