Table 4. --Partial list of organisms occurring in samples collected at stations 3 and 13 

 of Hugh M. Smith cruise 16, with the general estimated abundance classified 

 as present (x), frequent (xx), very frequent (xxx), and conspicuously abun- 

 dant (xxxx). Both stations were occupied at night (continued) 



Table 5. --Average volumes and night/day ratios of zoo- 

 plankton collected by Clarke-Bumpus san-iplers 

 on cruise 16 for 3 depths of sampling (twilight 

 hauls omitted) 



Table 6. --Certain statistics showing the mean volumes and extent 



of variation for the surface, intermediate, and deep hauls 



12 



