DIA'OFLAGELLATjE CERATIUM 215 



1899 January: Canaries to 33° N. 15° W. 

 February: 32° N. 47° W, 

 March: 21° N. 43° W. 

 April: 28°— 36° N. 74°— 75° W. 

 June: 19° S. 1° W.; 3° S. 20° W. to 7° S. 14° W.; 9° N. 25° 



W.; 21° N. 45° W. 

 July: 28° N. 40° AV.; 40° N. 38° W. 



Temperature: 21.4, mean of 101 obs., max. 28.i, min. 9.«. 



Salinity: 35.7-, mean of 71 obs., max. 37.4o, min. 33.2o. 



Plankton-type. Occurs in the Mediterranean, the Red Sea 

 and Indian Ocean, in the Atlantic in the S. Equatorial and Brazil 

 Currents. It follows the Equatorial Current along the N. coast of 

 S. America into the Caribbean Sea, thence the Antilles and Florida 

 Currents to the south of the Newfoundland Banks, between 40° and 

 45° N., where it occurs abundantly from July to -September, thence, 

 in the winter, to the space between the Azores, Gibraltar and the 

 Canaries. It occurs in the Sargasso Sea not rarely from December 

 to May, more rarely later. — D. 



CERATIUM DIGITATUM SchCtt. 



(D. Peridineen d. Plankton-exp. PI. XII fig. 42.) 



1898 February: Caribbean Sea. 

 March: 7° N. 55° W. 

 April: Caribbean Sea. 



Temperatupe: 24.8, mean of 4 obs., max. 26.65, min. 20.-. 



CERATIUM (FUSUS VAR.) EXTENSUM Gourret. 



{CoraUum fastis Schutt Pfl. d. Hochsee pag. 271 fig. 80. C J'usiis var extensuin 

 Gourret Ann. du Mus6e d' hist. nat. de Marseille, zool. Vol. I n. 8 pag. 52 PI. 

 IV fig. 56. C. fiisus var. longiseto Cl. K. Sv. Vet. Akad. Handl. Vol. XXXII n. 3. 



pag. 3, nomen nudum.} 



1898 January: 1° S. 26°— 27° W.; 11° N. 52° W.; 18° N. 46° W. to 

 45° N. 13° W.; Caribbean Sea; 26°— 32° N. 74° W.; 7°— 8- 

 N. 22°— 21° W.; 44°— 46° N. 17°— 11° W. 

 February: 5° S. 9° E.; 16 N. 71° W. to 30° N. 74° W. 



