210 DINOFLAGELLAT.K — CEKATIUM 



Xovriaber: V N. 28° W.; 29° N. iH'^ W.; 45° N. 36° W.; 



Azores. 

 Doccinher: Azores. 

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

 Februarti: 32° N. 47° VV. 

 Marclr. Azores to the Engl. Channel. 

 April: area between iO" N. 15°— 16" W.; 46-' N. 13' W. and 



42° N. 18° W. 

 June: 15° N. 50° W., rare. 



August and Scpfcmhrr: 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: 35.85, mean of il obs., max. 37 .os, min. 32.96. 



Plankt.Qn-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 tovsrards 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 

 rarely. — N. 



CERATIUM (TRIPOS VAR.) AZORICUM Cl. 



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



1898 April: Azores. 



1899 January: 34° N. 12° W. 



Marrli: 36°— 37° N. 29°— 26° W.; 46° x\. 11° W. 

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

 May: 25° S. 7° E. 



Temperature: 12"— 19° 

 Salinity: 35. 70 to 36.33. 

 Plankton-type: S 



