-od DI NOFL Af; KLLATA-. — PF.RIDI N lUM 



PERIDINIUM BLACKMANI Mariu. & Whitt.i 

 (Trans. Linn. Soc. London. 2 Ser. Bot. Vol. V part. 9. PI. XXIX (in. 6, 1899.) 



1897 December: Caribbean Sea. 



1898 Jainiari/: T N. 51" W. 

 .l/jn7:"l6°— 22^ N. of)— 47^ W. 

 Jtme: 28'" N. 42° W. 



July: 15° N. 71° W 

 October : 30° N. 74° W. 

 iJeceniber: 18° N. 67" W. 



Temperature: 25 to 27.2. 



Salinity: 35. 70 to 86.92 (exceptionally ol.ss). 



Plankton-type. This 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. 

 — D. 



PERIDINIUM CATENATUM Levander. 

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



1899 July: 80° N. 16" E. 



September: 73°— 80° N. 18°— 13" E. 



Temperature: — O.30 to 6.80. 



Salinity: 34.22 — 34.88 (exceptionally 25.s6). 



Plankton-type. This small and characteristic species occurs 

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

 I'anatom. 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 

 P catenatum, which thus probably occurs so far south. Va^'hoffek 

 found P catenatum in Davis's Strait (May and September 1893). 



' Murray's and Whitting's data used. 



