STl'DIES OF FERTILIZATION 



521 



Fif;. I l'li()t()t;r;ii)li of ajinrcjial i<iii of a Nereis sixtiii suspeiisiini, lakeii '.Ml sec- 

 onds aftfr mixing f hi; suspension; natural si/e; <l<'serip( ion in te\l. 



Fig. 2 Another suspension pliotugiaphed at !H) seconds; descrii)t ion in text. 



