Localization of the Nemertine Egg. 305 



Fig. 8. 



Fragments Obtained from Eggs with One Polar Body. 



A, 8-i6-cell stage of a fragment (=14/5 of egg), obtained by a vertical cut; 

 side view; variations from the normal whole in rhythm of division, in size re- 

 lations and in position of blastomeres are to be noted. B, side view of same 

 egg from other side after a horizontal rotation through 180 degrees. C, same 

 egg viewed from lower pole. D, 8-i6-cell stage of the lower fragment ( — 6/7 

 of egg), obtained by a horizontal cut; side view; variations are to be noted in 

 rhythm of division and size relations of cells. Judging by the character of the 

 cut, the fragment probably contained the sperm nucleus without the egg 

 nucleus. E, 4-6-cell stage of fragment (=^3/5 of egg), obtained by a vertical 

 cut. F, 8-cell curved plate form of same. G, lo-cell curved plate form of 

 same. H, larva from fragment (=zupper 2/3 of egg), obtained by a horizontal 

 cut. 



