UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 4, No. 7, pp. 387-393 April 22, 1908 



CONTEIBUTIONS FROM THE LABOEATOKY 



OF THE 



MABINE BIOLOGICAL ASSOCIATION OF SAN DIEGO. 



XXII. 



NOTES ON SOME OBSCURE SPECIES OP 

 CERATIUM. 



BY 



CHARLES ATWOOD KOFOID. 



The publication of the preceding paper (Kofoid ('08)) has 

 necessitated the recognition of certain species in the genus Cera- 

 tium which either have not appeared in the current literature 

 dealing with this polymorphic genus, or if they have been cited, 

 the nomenclature used requires revision. 



In 1874 Ehrenberg, in a paper published in the centennial 

 volume of the "Gesellsehaft fiir Naturforschenden Freunden zu 

 Berlin" under the title "Die das Funkeln und Aufblitzen des 

 Mittelmeeres bewirkenden unsichtbar kleinen Lebensf ormen " 

 figured and described briefly several species of Ceratium which 

 seem to have been overlooked generally by subsequent investi- 

 gators. Ehrenberg 's paper has escaped the notice of later mono- 

 graphers, even of Biitschli ( '83- '87) and of Schiitt ( '95 and '96), 

 for neither lists it in his bibliography of the Dinoflagellata. 



Among other organisms of the plankton this paper describes 

 four species of Ceratium as of the genus Peridinium, to wit: 

 P. Trichoceros, P. Candelabrum, P. eugrammum, and P. Seta. 

 Of these P. candelabrum was later recognized by Stein ('83), 

 who, however, reduced P trichoceros to a synonym of C. tripos, 



