Early Development of the Hen's Egg. 



121) 







18 



Pig. 18.— Section through plane «— ?>, Fig. 14. m.n., marginal coll nucleus; 

 s.ii., supernumerary sperm nucleus with a cleft lying just above it. X 73. 





:-::;.V.••^:.■^■:::^•^:■;•"•.v:^•.U'^ 

 .s;£-.:.-.*:..>.-..: .••,;.:;•. /X/V;'.!;;'- 



19 



Fig. 19.— Anterior portion of a section through c— rf, Fig. 14. s.n., sperm 

 nucleus; a.f., accessory cleavage furrow; p.f., terminal portion of a primary 

 cleavage furrow with membrane. X 66. 



