416 University of California Publications in Zoology [Vol. 22 



production and distribution. Still, it seems to be fairly certain 

 that diatom production would be somewhat limited by the higher 

 specific gravity and more intense sunlight of a shallow bay of this 

 type, hindrances which were here probably augmented by higher 

 temperatures. 



The species of diatoms obtained in these collections were the typical 

 neritic marine forms of the region. Eucampia zoodiacus Bhr. was the 

 most abundant and Chaetoceras debit e CI. was next. There is nothing 

 in the appearance of the catches (except the debris) to indicate that 

 they were not taken at our pier or in some of the boat series, off shore. 

 Such components of the plankton give, of course, still further indi- 

 cation that the diatom population was much more dense in the sea 

 outside of the bay than it was in the bay at the time of making these 

 collections. 



While these samples of water and plankton were somewhat dis- 

 appointing in that they yielded no positive guides to general inter- 

 pretations, they have very distinct value in that they show the 

 importance of understanding local conditions when attempting to 

 interpret chemical, physical, or biological phenomena. They also 

 show the risk of trying to interpret natural phenomena from meager 

 or localized or discontinuous or inappropriate data. They derive 

 additional value through the proof they furnish that much valuable 

 work can be clone from a location such as this on the entrance to a bay. 



LITERATURE CITED 

 Allen, W. E. 



1921. Some work on marine phytoplankton in 1919. Trans. Am. Mier. Soc, 

 40, 177-181. 



