DINOFLAGELLATiE — -OXYTOXUM 253 



OXYTOXUM CONSTRICTUM (Stein).i 

 {PyrgkUnin constr. Stein. D. Org. d. Infus. PI. V. fig. 15 — 18.1 



1898 January: 36° N. 30° W. 



FebruaTy : 34° N. 31° W. to 27° N. 41° W. 



March: 30° N. 44° W.; 44° N. 21° W. 



April: 29° N. 38° W. to 22° N. 47° W.; 19° N. 52° W. to 16° 



N. 56° W. 

 May: 44° N. 20° W. to 33° N. 42° W. 



1899 July: 28° N. 40° W., very rare. 



Temperature: 21.8, mean of 22 obs., max. 27.2, min. 12.2 

 (Murray's- and Whitting's data). 



Salinity: 37.4o (one obs. only). 



Plankton-type. Noted from the Mediterranean. — 1). 



OXYTOXUM CRIBROSUM Stei.v. 

 (D. Org. d. Infus. PI. V fig. 4.) 

 1898 August: Azores, very r&re. 



Temperature: 21.2. 

 Salinity: 36.25. 

 Plankton-type: 1). V 



OXYTOXUM DIPLOCONUS Stein.-' 



(Schutt: D. Peridineen d. Plankton-exp. P), XVII fig. 54.) 



1898 February. 27°— 28^ N. 41°— 39° W. 

 March: 34°— 39° N. 39°— 32° W. 

 April: 10° N. 53° W 

 May: 45° N. 43° W. 

 September: 47° N. 9° W. 

 October: 57° N. 27° W. and 61° N. 6° W. 

 November: 36° N. 14° W. and 49° N. 12° W. 

 December: 50° N. 9° W. 



^ Murray's & Whitting's data used. 



■' Ostenteld's and Murray's & Whitting's data used. 



