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



tion during the months of tlie year 1898. Later, I will treat of 

 the distribution of the tricho-plankton forms, and, finally, of 

 some species tliat characterize the northern neritic plankton. 



Chsetoceros decipiens Cl. in 1898. 



March and April. — NW. and S. of Iceland to the Färöes, 

 the Shetlands (abundant), Scotland and into the North Sea. — 

 More or less abundant in several spots from 47° N. 27° W. 

 and the Azores to Brittany. — Davis Strait (about 62° N. 50° 

 W.). ') — Newfoundland banks along the American coast, 

 abundantly from 43° N. 52° W. to 40° N. 72° W. 



May. Sparingly between Jan Mayen and East Greenland. 

 South Iceland. Very abundant from the north of Rockall to 

 the Shetlands and thence to 61° N. 3° E. — Common W. of 

 Greenland (63° N. 54° W.) and above the Newfoundland banks, 

 or from 41° N. 53° W. to 45° N. 41° W. 



June. Sparingly N., W. and S. of Iceland, sparingly be- 

 tween the Färöes and the Shetlands. Very abundant at 62° N. 

 2° 30' E. as well as between Norway and Beeren Island (from 68° N. 

 13° E. to 74° N. 22° E.) and not rare east of Spitzbergen. — 

 Rare at Cape Finisterre. Davis Strait (63° N. 56° W. not 

 rare to ^16° N. 55° W. common). 



July. More or less common S. of Iceland, rare WNW. of 

 Iceland, sparingly round the Shetlands, at 60° N. 17° — 20° E. , 

 and 66° N. 7° E. Not rare W. of Spitzbergen (78° N. 3° 

 W.— 5° E.). 



August. Rare at the Shetlands, common E. of Spitzbergen 

 (77°_80° N. 10°— 34° E.). Sparingly from S. Iceland along 65° 

 to East Greenland. 



September. S. of Iceland, rare between the Färöes and the 

 Shetlands and between Norway and Beeren Island. — Very rare 

 in the Irminger Sea. 



October. Rare S. of Iceland and thence to the Shetlands. 



•') For the sake of simplicity I have in.most cases omitted the minutes. 



