256 DIXOFLAGELLAT^. — PERIDIXIUM 



PERIDINIUM BLACKMANI Mlim;. cV Whitt.' 

 (Trans, l.inn. Soc. London. 2 Ser. Hot. Vol. V part. D. J'l. XXIX li^i;. 6, 1899.) 



1897 Decciitbcf: Caribbean Sea. 



1898 JafNian/: T N. 54° W. 

 April: US''— 22° N. 55°— 47= W. 

 June: 28° N. 42° W. 



July: 15° N. 71° W. 

 October: 30° N. 74° W. 

 December: 18° N. 67° W. 



Temperature: 25 to 27.1-. 



Salinity: ^Jo.to to 86. oi (exceptionally 34.88). 



Plankton-type. Thi.s species occurs at all seasons in the 

 western tropical Atlantic, in the Equatorial Current N. of S. America, 

 in the Caribbean Sea and the Antilles Current, from 7° to 30° N. 

 — 1>. 



PERIDINIUM CATENATUM Levander. 



(Acta Soc. p. Fauna iV Flora Fennica IX n. 10 1894.) 



1899 Juhj: 80 N. 16° E. 



Septembrr: 73°— 80° N. 18°^18° E. 



Temperature: — O.30 to 6.80. 



Salinity: 34.22 — 84.8H (exceptionally 25.36). 



Plankton-type. This small and characteristic species occurs 

 in the Baltic (Bay of Finland and at Roslagenl Pouchet (Journ. de 

 Tanatom. et de physiolog. Vol. XIX, 1883. pag. 441 fig. 36) has re- 

 presented a form the French coast, that seems to be the same as 

 y*. cafenatiuH, which thus probably occurs so far south. Vaxhoffex 

 found P. catenaliim in Davis's Strait (Mav and September 1893). 

 -Kg. 



^ Murrav's and Whittintf's data used. 



