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University of California Publications in Zoology [Vol.22 



The most marked departure from this expectation is to be noted in 

 the La Jolla series of diatom catches, graphically shown in figure 1 

 and recorded in the first column of table 1. Here on January 29 was 

 begun a very remarkable increase of production which was well 

 sustained for a period of eight weeks, after which the markedly pro- 

 ductive periods, distributed in five groups, did not endure more than 

 three weeks. In fact, the period of heaviest production, which came 

 early in May, lasted only a little more than a week and the period of 

 next heaviest production was largely confined to the last week of June 

 and the first week of July. Evidently the moderate pulse of pro- 

 duction occurring in September was the only one meeting ordinary 

 expectations. 



Fig. 1 



Unfortunately the Pt. Hueneme series was not opened until 

 February 1 and it may have missed most of a period of heavy pro- 

 duction, a part of which is indicated in the case of diatoms for the 

 week ending February 4 (fig. 1 and table 1). At any rate the heaviest 

 production of the year occurred in the last week of April and the 

 first week of May, a date also somewhat earlier than usually expected. 

 The period of best sustained production was through most of June 

 and July which is fairly near to expectation. There is, however, no 

 marked pulse in autumn. 



Since the numerical distribution of the dinoflagellates at the two 

 stations was somewhat similar to that just described for the diatoms, 

 it is not necessary to discuss them in detail. Figure 1 and table 1 give 



