190 University of California Publications in Zoology. [Vol. 8 



Diego jMarine Biological Station during the past ten years, and 

 upon certain collections made in Alaska in the summer of 1905 

 by the U. S. Bureau of Fisheries Str. "Albatross." Permission to 

 use the data from the latter source has been kindly granted by 

 Hon. Geo. ]M. Bowers, U. S. Commissioner of Fisheries. 



Grateful acknowledgments are here made to the San Diego 

 Marine Biological Association for its continuous interest in and 

 support of this work, to the Smithsonian Institution for the privi- 

 leges of their research table at the Naples Zoological Station in 

 1908, and to Mr. R. W. Harvey, Miss Ethel Abeel. and especially 

 to i\Irs. Josephine R. IMichener for drawings. 



The plankton from the coast of California at my disposal is 

 primarily oceanic, but this is supplemented by neritic collections 

 from San Diego Bay, San Pedro Harbor, and from San Francisco 

 Harbor, while that in the collection from Alaska is primarily 

 neritic. The southern oceanic plankton taken off San Diego 

 from deeper levels (50-100 fathoms) contains considerable mor- 

 il)und plankton of northern (Alaskan) facies. 



In addition to the material above noted the writer has had at 

 his disposal, but not included in the scope of the present paper, 

 the very extensive collections of the expeditions of the Str. 

 "Albatross" to the Eastern Tropical Pacific of 1904-1905 and to 

 the Northern Pacific in 1905-1906. as well as numerous collections 

 from European waters made during his tour of the biological 

 stations of Europe in 1908-1909. The material upon which this 

 study is based is therefore both extensive and representative. 

 ]\l3^ especial thanks are tendered to Dr. Andrew Scott of Piel-in- 

 Barrow, for a collection rich in Dinoflagellata, from the Faeroes 

 Channel. 



The collections of plankton made during the past ten years 

 mainly at San Diego and San Pedro and in the California Cur- 

 rent off these ports are distributed through all seasons of the 

 year, but more especially during the summer and in mid-winter. 

 Nearly every collection contains one or more species of 

 Gonyaulax. 



In all fourteen species have been recorded. Of these four are 

 new, G. alaskensis, G. diegensis, G. sphaeroidea and G. scrippsae. 



