26 



of Bergh (1881)\ Hensen (1886)', Ent/, (1902)" and Zacharias 

 (1906)', along with typical n. fiur.a and d. lineatum (the so-called C. 

 fiirca var. baltica Moeb. nomen nudum), 

 but in no case has it been accorded spe- 

 cific recognition, except by Vanhoeffen 

 (1897)8 who described it as Jl/ceralium 

 debile. 



In the course of my investigations 

 in the Dinoflagellata" of the plankton [ 



Pig. 1 — 4. Dorsal views of thecae of Ceratium furea, C. lineatum, C. eugrammum 

 and C. teres. I — IV, precingular plates. X 500. Original. 



* Bergh, R. S., Der Organismus der Oilioflagellaten. Eine phylogenetische 

 Studie. Morphol. Jahrb. Bd. 7. S. 177—288. Taf. 12-14. 1881. 



5 Hensen, V., tjber die Bestimmung des Planctons oder des ira Meere trei- 

 benden Materials an Pflanzen und Tieren; nebst Anhang. Flinfter Ber, Komm. 

 z. wiss. Unters. d. d. Meere. S. 1—208. Taf. 1—6. 1887. 



6 Entz, G. jr., A Quarnero Peridineai. Novenytani Kbzlemenyek Bd. 1. 

 p. 83-86, Taf. 1—6. 1904, 



■> Zacharias, 0., Uber Periodizitat, Variation und Verbreitung versohiedener 

 Planctonwesen in siidlichen Meeren. Arch. Hydrobiol. u. Planktonkunde. Bd. 1. 

 S. 498-575. 23 Taf. 



8 Vanhoeffen, E., Die Fauna und Flora Gronlands. Grbnland Exp. d. Ges. 

 f. Erdkde. Berlin 1891-1893. Bd. 2. S. 1—383. Taf. 1-8. 1897. 



9 Kofoid, C. A., Dinoflagellata of the San Diego Region. III. Descriptions 

 of new species. Univ. of Calif. Pubs. Zool. Vol. 3. p. 299—360. pis. 22—33. 



