DINOFLAGELLAT.E — PERIDIXIIM 265 



Aiiguai: Azores; 41° N. 50° W.; 50°— 49° N. 10°— 14° W.; 55° 



—54° N. 41^^— 47-' W.; 60° N. 3° W. to 63° N. 15° W. 

 Srpri'nihrr: Azores; 5(i" N. 28° W. to 55° N. VS' W.; area 



between the Shetlands, 60° N. 10° W and 63° N. 7° W.; 



62° N. 21° W'.; 65° N. 36° W ; 59° N. 34° W. to 58° n! 



39° W.; 60° N. 55° W. 

 October: Shetlands to 63° N. 14^ ^\'. and 60" N. 10° W.; 



59" N. 21° W. to 58° N. 48° W. 

 Xovi-nibcr: Shetlands to 63° N. 13° W.; 56° N. 22' 29' W.; 



52° N. 38° W.; 53' N. 50° W.; 42" N. 64- W. to W° N. 



67° W. 

 iJeci'iiihcr: 22° N. 56° W.; Azores (common); 41° X. 66° W. 



to 62° N. 10° W, (very rare). 

 1899 January: 41° N. 69" W." 

 Febraary: 32° N. 47° ^x 



March: 46°— 37° X. 29—26- W.; 64' X. 12' W. 

 April: 32° X. 75° W. 

 May: 50° N. 33°— 39" W.; 35° X. 75° W. 

 June: 21° X. 45' W. 

 July: 58° N. 23" W.; 57"^ N. 31° W. 

 Augu.sl: 55° N. 26' W.; 56° N. 38° W. 

 Srprcinbcr: 56 N. 30" W. to 54° X. 40' W., as a rule 



common. 

 October: area between 56' N. 23°— 38° ^V and 53' N. 25'— 



37" "\V., common in the west. 

 Xoceiiibrr: 51° N. 28° W., not rare. 



" Temperature: 12.o, mean of 32 obs., max. 22, rain, 3. (no ob- 

 servations relating to a rare occurence considered). 



Salinity: 35.i5, mean of 28 obs., max. 36.25, min. 34.16. 



Plankton-type. This species occurs in the Red Sea and the 

 Indian Ocean. It is a typical Styliplankton-form, with essentially 

 eastern distribution, occurring only rarely North of S. America, in 

 the Caribbean Sea and the Florida Current. The principal area of 

 distribution is from the Azores northwards, in May between 40° and 

 50° N., across the whole Atlantic, in July round the S. end of Green- 

 land, in October from the Shetlands across the Irminger Sea and 

 into Davis's Strait. It appeared in November north and south of 

 the Newfoundland Banks — .S. 



