796 P. T. CLEVE, SOME ATLANTIC PLANKTON-ORGANISMS. 



July. At 77°— 78° N. and 0^ 17' W. — 7^ 30' E. to N., W. 

 and S. of Iceland to the Färöes, into the Färöe Channel, to the S. 

 of the Shetlands and to the NW. of Rockall (59° N. 21° W.) 

 — Irminger Sea — SW. of Greenland (57° N. 47°. W.). 



August. East Greenland (70° to 66° N.), Denmarks Sound, 

 round Iceland to the Färöes and the S. of the Shetlands — 

 The Irish Channel — Davis Strait to Disco — Newfoundland 

 banks at 42°— 52° N. 48°— 55° W. 



September. Round Iceland to the Färöes and Scotland. 

 N. of Norway to Spitzbergen, 71° — 76° N. 20° — 0° 13' E. — Den- 

 marks Sound. — At 55° N. 35° W. — W. Greenland from 65° 

 N. to Disco — Davis Strait. 



October. From Iceland to the Färöes and Scotland. — Frora 

 57° N. 27° W. and 58° N. 32° W. to Greenland and Davis 

 Strait— Newfoundland banks, 42°— 41° N. 50°— 67° W. 



November. From S. Iceland to the Färöes, the Shetlands, 

 the Orkneys and Scotland. Ahujidant at 5V N. 20" W. — At 60° 

 N. 34° W. — At 55°— 40° N. 36°— 67° W. 



December. The Orkneys. — At 48°— 33° N. 40°— 61° W. 



This characteristic species, which occurs also in the Bering 

 Sea, has the same distribution in the northern Atlantic as the 

 other forms of the tricho-type, but does not spread so far into 

 the south Atlantic during the winter. 



Ceratium (tripos var.) arcticum Ehe. ^) in 1898. 



February. SW. of Ireland (50° N. 10° W.). 



March. At 71° N. 1° 30' W. and 63° N. 1° 30' E. — East 

 Greenland (68° N. 26° W.). — From 42° N. 42° W. to 40° N. 

 72° W. 



April. At 74°— 75° N. 4^-9° W. — From 43° N. 51° W. 

 to 42° N. 61° W. 



May. From 71° N. 16° W. to 78° N. 2° 30' W. At 48° 

 N. 33° W. and 45° N. 41° W. From 45° N. 45° W. to 40° 

 N. 72° W, 



= Cer. trijß. v. labradorica Schutt (the v. longipes Bail. not included). 



