244 University of California Piihlications in Zoology. [Vol.8 



edra, and this localization of a region of fermentation is doubt- 

 less the immediate cause of the destruction of the large numbers 

 of the representatives of the bottom fauna. 



— -.^gs^^^^ --^:^ 





Fig. E. Shore at East San Pedro, California, in August, 1907, during 

 an outbreak of red water, showing dead fishes and invertebrates stranded 

 on the shore at low tide. Photograph by Professor W. R. Coe. 



This species is the most abundant dinoHagellate of the San 

 Diego region during summer months and is found in small num- 

 bers throughout the year in both oceanic and neritic plankton. 

 It is found at least as far north as San Francisco along the coast 

 of California. 



It is widely distributed in temperate and subtropical waters 

 of coastal regions, but apparently is not common in the more 

 strictly oceanic plankton. The extensive records of Cleve (1901a, 

 1902) for the Atlantic do not contain this species, and it appears 

 in the many collections of the International Commission for the 

 Investigation of the Sea (see Ostenfeld, 1906, 1909) only 



