210 1)IN0FLAGELLAT>: — CERATIUM 



Xori'mhcf: 4" N. 28° W.; 29° N. 43° W.; 45° N. 36° W.; 



Azores. 

 Deremhei': Azores, 

 1899 January: 33°— 36° N. 15°— 9° W. 

 February: 32° N. 47° W. 

 March: Azores to the Engl. Channel. 

 April: area between 40° N. 15°— 16° W.; 46° N. 13° W. and 



42° N. 18° W. 

 June: 15° N. 50° W., rare. 



August and September: 56° N. 23° W., very rare. 

 October: 53° N. 25°— 31° W. to 56° N. 31° W., rare. 

 November: 51° N. 13° and 34^ W., rare. 



Temperature: 19, mean of 55 obs., max. 27.2, min. 9.8. 



Salinity: 35.s.-i, mean of 41 obs., max. 37.o5, min. 32.96. 



Plankton-type. This form occurs in the Indian Ocean. Its 

 principal area of distribution in the Atlantic is the eastern, tempe- 

 rate part. Nevertheless it has been found, although rarely, in the 

 Equatorial Current, Caribbean Sea and the Antilles Current. In 

 March and April it occurs from the Azores towards the Engl. Chan- 

 nel, but in May it spreads across the whole Atlantic, between 40° 

 and 50° N., but later in the year it has been found there only 

 rarelv. — N. 



CERATIUM (TRIPOS VAR.) AZORICUM Cl. 



(Kongl. Sv. Vet. Akad. Hand]. Vol. XXXIV n. 1 PI. VII fig. 6, 7.) 



1898 April: Azores. 



1899 January: 34° N. 12° W. 



March: 36°— 37° N. 29°— 26° W.; 46° N. 11° W. 

 April: 40° N 16°— 18° W. to 44° N. 15° W. 

 May: 25° S. 7° E. 



Temperature: 12°— 19° 

 Salinity: 35.7o to 36.33. 

 Plankton-type: N 



