No. I.] FILOSE ACTIVITY IN METAZOAN EGGS. 7 



nor in the enlargements on their pseudopodia, into which they 

 were sometimes carried; vacuoles, however, are indicated in 

 the main part of each polar body. The short, apparently blunt 

 filaments projecting from the edge of the cell uppermost in the 



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t'lG. 2. 



figure really represent threads that bent abruptly and extended 

 far inward, and were, in most cases, attached to distant cells of 

 the blastula. 



This opening into the blastula closes in with change in posi- 

 tion of the adjacent cells, and with changes in the character of the 

 filose activities that lead one to conclude they are instrumental 

 in associating the cells more intimately. Thus in Fig. 2 a later 

 stage shows the cleavage pore reduced to a few small chinks 

 between the cells that have glided over it. The polar bodies 

 were here taken inside, and are represented, lying one over the 

 other, by the black mass to the left. 



