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



Eadiolaria. 



Acanthocliiasina fusiforme Hkl. — Rare in November: NE. of Scotland and E. of 

 Newcastle. In the SW. of Norway. — Plyinoiith: rare in January, common in August, 

 rare in October. — The Skagerak: very rare in December. 



Acanthouia Miilleri Hkl. — North Sea very rare in November between Scotland 

 and the Orkneys. 



Acanthometron fuscum Mull. — Very rare ia the Skagerak, January (31st) and 

 February (1st). 



A. elasticum Hkl. — Very rare in June W. of Stadt in Norway. 



A. qiiadrifolium Hkl. (incl. A. catervatum and Acantliostauros paUidus). — North 

 Sea: March: in the company of Halosphcera not rare in several spöts from the N. and 

 E. of Scotland to the W. of Norway (63° 1' N. 1° 36' E.) and in the chaäto region to the 

 Skagerak. Also above the depression south of Dogger bank. November: rare, together 

 with Halospheera, from the N. of Scotland to the S. of Norway and the Skagerak. — 

 The Skagerak: rare in September, October. 



Dictyoclia flbula Ehb. — Plymouth: rare in August. In November rare W. of 

 Jutland. The Skagerak: rare in January and in November, December. 



Gazelletta hexanema Hkl. — In November very rare S. of the Orkneys. 



Litholoplins ■ ligiirinns Hkl. — Very rare W. of Stadt (Norway) in June. 



Plectophora ai-aclinoides (Clap & Lachm.). — March: rare at Skagen. November: 

 rare N. of Scotland and above the Fisher Bank. — The Skagerak, very rare in January, 

 February. 



Eliizopoda. 



GloMgerina bulloides d'Orb. — Rare in March at 58° 21' N. 1° 40' E. and at 



58°40'N. 4° 18' E. 



Cystoflagellata. 



Noctiluca miliaris Surir. — The E. Channel: at Plj^mouth common from the end of 

 June to the end of July, rare in September, common from October to December. Southern 

 North Sea: abundant in June from the E. Channel to the NW. of Heligoland. July to 

 September: common from the E. Channel to the coast of Holland, rare from September to 

 November. The Skagerak, rare in December. 



