No. 7. — Reports on the scientific results of the Expedition to the Eastern 

 Tropical Pacific, in charge of Alexander Agassiz, by the U. S. Fish 

 Commission Steamer "Albatross," from October, 1904, to March, 

 1905, Lieut. Commander L. M. Garrett, U. S. N., Commanding. 



XXII. 



New genera and species of Dinoflagellates. 

 By Charles Atwood Kofoid and Josephine Rigden Michener. 



The continued examination of the collections of the Expedition 

 has brought to light a number of new species in addition to those 

 previously described by the senior author (1907). Among them 

 are representatives of two new genera, Peridiniella, related to Peri- 

 dinium, and Berghiella of indeterminable relationships. Figures, 

 fuller descriptions, and discussion of distribution will appear in a later 

 memoir. A map giving location of stations will be found in the 

 earlier paper (1907) and full data pertaining to them in Mr. Agassiz's 

 account (1906) of the Expedition. 



Throughout the descriptions the terms right and left are used as in 

 the organism, not on figures. Transdiameters are measured at the 

 girdle margin, excluding fins, unless otherwise stated. A description 

 of the system of nomenclature of plates will be found in a paper by 

 the senior author (1909). 



The following is a list of the species described or discussed in this 

 paper. 



DINOFLAGELLIDIA. 

 DINIFERIDA. 



PERIDININA. 



Ceratiidae. 



1. Gonyaulax acuta 6. Gonyaulax pavillardi 



2. Gonyaulax expansa 7. Gonyaulax reticulata 



3. Gonvaulax subulata 8. Gonvaulax senta 



4. Gonyaulax areolata 9. Gonyaulax paucula 



5. Gonyaulax minuta 10. Gonyaulax inclinata 



