Ceratium furca: The distribution of C. furca (fig. 14) is 

 similar to that of C. fusus. Points of highest concentration 

 were found at 28 feet 2100 6 July, 8 feet 09 00 7 July, and 

 48 feet 1300 7 July. The centers of the first two concentra- 

 tions were within the most turbid areas and probably con- 

 tributed to light attenuation in the same fashion as C. fusus. 

 However, the near-bottom concentration at 48 feet 1300 

 7 July was in water showing 70-percent transmission. Thus, 

 this isolated maximum had little effect on light transmission. 



1800 



2200 



0200 0600 



TIME (HOURS) 



1000 



1400 



Figure 14. Distribution of Ceratium furca (organisms per ml), with transparency 

 data (percent transmission) in red, Operation I. 



31 



