166 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Table 16. — Distribution of species and tows and the expected 

 number of tows on a hypothesis of a Poisson distribution, 

 1948-51 



a. Year 1948 



b. Year 1949 



d. Year 1951 



Table 17. — Observed frequency of plaice eggs in 50 lows 

 with a plankton net 



[Data from Buchanan-Wollaston, 1923] 



Table 18. — Observed and expected frequencies of plaice eggs 

 in 50 toivs with a plankton net 



