DlATOMAl'.E^ — RHIZOSOLENIA ;549 



Temperature: 14.8, mean of 27 obs., max. 27.2, min. 8. 



Salinity: 35.06, mean of 21 pbs., max. 36. n, min. 32. eo. 



Plankton-type. This species occurs along the continental 

 coasts from Cape Verde to the English Chaanel and west of the 

 British Islands to the Shetlands. Rare specimens drift to the south 

 of Iceland. It occurs also along the North American coast from the 

 Newfoundland Banks at least to 67° W. It has only once been ob- 

 served north of South America. It is very common in the summer 

 in the English Channel and in the southern North Sea. According 

 to Lemmer.mann it occurs in the Mediterranean, the Pacific and the 

 China Sea. I have seen it in plankton from Jedo Bay- — y^m. 



RHIZOSOLENIA STYLIFORMIS Brtw i 

 (V.\N- IlEURCK Syn. PI. LXXVIII fig. 1—5.) 



1898 January: 0' N. 26" W. to 21° N. 17° W.; Azores to 46° N. 

 11° W.; 63° N. 20° W.; 7° N. 53° W. to 14° N. 49° W.; 

 Caribbean Sea ; 26°— 32° N. 74° W. 



February: 50° N. 10= W.; 63° N. 17° W.; Caribbean Sea; Ba- 

 hamas; 26° N. 74° W. 



March: 4°— 1° S. 10°— 15° W.; 18° N. 18 W.; 25° N. 16MV.; 

 33° N. 32° W. to the Engl. Channel; from 40° N. 68°— 72 

 W. to 51° N. 27° W. and the Engl. Channel; 15° N. 49° W. 

 and 25° N. 41° W., rare; Caribbean Sea; 28°— 32° N. 74° W. 



April: area between 34° N. 75° W., 40° N. 70° W., the Engl. 

 Channel and 41° N. 19° W.; 58° N. 38° W. to 59° N. 22" 

 W. and at 60° N. 4° W., rare. 



May : Azores to Cape Finisterre; from New York to the mouth 

 of the Engl. Channel; area between 57° N. 38° W., 61° N. 

 28° W., 60° N. 9° W and 57° N. 25° W.; Davis's Strait, 63° 

 N. 54° W., very rare; area between 11° N. 52° W., 16° N. 

 71° ^\. and 23° N. 56° W. 



June: area between 45° N. 26° W., 42° N. 9° W. and 48= N. 

 17° W.; area between S. Iceland, the Faroes and 60° N. 9° 

 W.; 19° N. 63° W. to 31° N. 50° W.; 41° N. 59° W.; 45° N. 

 41° W. 



' Ostenfeld's data used. 



