DINOFLAGELLAT.F, — PROTOCERATIUM, PYROPHACUS 'l t i 



PROTOCERATIUM RETICULATUM Clap. & Lachji.^ 

 (SchCtt D. Peridineen d. Plankton-exped. PI. VII fig. 28.) 



1898 January: 35° N. 74° W. 



February: 26°— 34° N. 74" W. 



August: 69° N. 53° W., common. 



Septciitber: 60° N. 4° W., rare. 



October: bT N. 27° W. to 60° N. 6^ W., rare. 



Xovember: 42° N. 64" W.; 60°— 63° N. 4°— l(r W. 



Temperature: at Disco (where common) 6.3, in the Irminger 

 Sea (where rare) lO.i, mean of 7 obs., max. 11 9. min. 6.5; in the 

 NW. of N. America (rare) I8.9, mean of 4 obs., max. 21°, min. 16. 2. 



Salinity: 32.9, (Disco); 35.30 (Irminger Sea, max. 35. ^s, min. 

 35.19). 



Plankton-type. The absence of this species in the tropical 

 and temperate Atlantic, its abundance off the W. Greenland and its 

 scarcity in the Irminger Sea point to the conclusion that it is an 

 arctic or northern neritic species, that drifts with the southward Ame- 

 rican Current and into the Irminger Sea. — Schroder mentions it 

 from Naples. — A"s. 



PYROPHACUS HOROLOGIUM Steix.^ 

 (D. Org. d. Infus. PI. XXIV, XXV fig. 1.1 



1897 Jjcccinber and 



1898 January: 20" N. 18" W. to 16° S. 37° W.; 12"— l(v N. 50- 



—48° W. 



February: 6°— 5° S. 10°— 0" E.; Caribbean Sea; 21° N. 74" W. 



March: 6° S. 4° W. to 7" N. 17°— 22° W.; 23° N. 28° W.; 

 25° N. 16° W.; 10" N. 53° W. to 18° N. 46" W.; Carib- 

 bean Sea. 



April: area between 10" N. 53 W., Barbados, 22° N. 47° W. 

 and 18° N. 46° W.; Azores. 



May: 11° N. 52° W. to 29° N. 39- W.; Azores; 48" N. 33° W. 



Ostenfeld's data used. 



Ostenfeld's and Murray's & Whitting's data used. 



