114 



Mr. E. A. Andrews on some 



and long slender processes were sent out and again drawn in ; 

 within a minute a long slender process extended out from a 

 polar body to the &gg, and seemed to join to it, and later was 

 represented by a tuft of short, pointed, contracted processes. 

 ]n many cases the polar bodies showed amoeba-like changes 

 of form, with or without pseudopodia ; in one case where 

 there were but two polar bodies they crawled over one 

 another with much of the appearance of amoebae, one of them 

 having a tuft of pseudopodia. 



In a lamellibranch moUusk, NucuJa delphinodonta, the 

 formation and activity of the polar bodies was observed only 

 in some eggs that were probably not fertilized and that did 

 not develop beyond an incomplete first cleavage. The two 

 polar bodies were seen to be connected by a cylindrical mass 

 of clear substance, and, as seen in figure 4, one polar body 

 was seen connected to the Qg2, by means of a long filament 

 as well as by an extensive sheet of faintly refracting material 

 similar to that seen in Cerehratulus. 



In this case the cleavage had passed in toward the centre 

 of the egg. The small eminence on one side illustrates one 



Fig. 4. 



of the several ectosarcal processes that at first were much 

 like protuberances found in Cerehratulus, and there giving 

 rise to brushes of fine spin-threads. Here, however, such 

 ectosarcal processes are followed by hernia-like protrusions 

 containing yolk and indicating the abnormal state of the tgg. 

 "With the 8 ocular and 4 millim. objective large star-like 

 radiations and central refracting areas were seen near the 

 first polar body as the second one was being formed. Com- 

 paring these with appearances seen with the same powers in 



I 



