24 P. T. CLEVE. THE PLANKTON OF THK NORTH SEA, THE ENGLISH CHANNEL, AND THE SKAGERAK. 



C. curvisetiis Cl. — In the North Sea: moi-e or less sparingly m.March SW. of 

 Norway, at Skagen and W. of Jutland, in November rare W. of Jutland. — In the 

 E. Channel at Plj^mouth more or less common in Mardi, very abundant in August, 

 September, at S:t Vaast la Hogue very abundant in October, November, at Helder rare in 

 September. — In the Skagerak more or less rare from January to April, very common 

 from August to November. 



C. densus Cl. (=-- C. borealis v. densa Cl.). — In March not rare on the Fisher 

 Bank. In June E. of Firth of Tay and more or less abundant from the mouth of the Schelde 

 to Schleswig. At Helder rare in June and not rare from August to December. In the 

 E. Channel at Plymouth more or less abundant from the end of March to the end of- April, 

 common in July, August, rarer in September. S:t Vaast la Hogue in June and from 

 October to December. In the Skagerak rare in the beginning of October. 



C. danicus Cl. — In the E. Channel at S:t Vaast la Hogue rare in July, at 

 Plymouth not rare in September. At Helder in November and December. In the 

 Skagerak from March to June, maximum in June, and from the end of October to 

 December. 



C. delbilis Cl. — In the North Sea in March SW. and S. of Norway, common at 

 Skagen, in June E. of Firth of Tay. — At Plj^mouth rare in April, at Helder common 

 from October to December. — In the Skagerak in January to June (maximum m March), 

 rarer in October, November. 



^j 



C. decipiens Cl. — A. In the North Sea. In March from Skagen to the W. of 

 Stavanger and 58° N. 1°30'E., along 55°— 56° N. from the Danish Peninsula to the E. of 

 Firth of Tay and Newcastle. At the spöt 53° 30' N. 3° 40' E. In June at one spöt be- 

 tween NorAvay and the Shetlands. West of Jutland 66° N., in November very sparingly 

 from the E. Channel to Jutland. — B. In the E. Channel at Plymouth more or less sparingly 

 from January to March, common in October, November, låter rare. At S:t Vaast la Hogue 

 very abundant in June, rare in October and December. — In the Skagerak January to 

 June (very abundant in Mardi), more or less rare in October, November. 



C. diadema Ehb. — Rare in March SW. of Norway. At Plymouth rare at the end 

 of September, at Helder rare in December. In the Skagerak from January to May 

 (abundant in March) and very common in November. 



C. didymus Ehb. — A. In the North Sea in March rare along the SW. and S. 

 coast of Norway, at Skagen and W. of Jutland. In June NW. of Heligoland. In No- 

 vember very rare from the E. Channel to the W. of Jutland. At Helder rare from August 

 to the end of November. — B. In the E. Channel: at Plymouth rare in March and in 

 October, common in November. At S:t Vaast la Hogue common in June and July, 

 v&ve. in August, more or less sparingly from the end of October to the end of December. 

 — In the Skagerak rare from January to March, more or less abundant from the end 

 of August to December, maximum September, October. 



