bedded in the shell, while their tails continued in 

 motion. These spermatozoa were somewhat like 

 little transparent tadpoles, except that their highly 

 hyaline heads were rounded, and their tails ex- 

 tremely slender and drawn out to considerable 

 length. 



Not many minutes after the penetration of a 

 lucky spermatozoon, the germinal spot vanished, 

 the yolk began to form a furrow completely around 

 its periphery, and as a consequence the egg com- 

 menced to lose its spherical shape and achieved a 

 symmetrical one distinguished by distinct halves. 



The furrow rapidly deepened, and soon the egg 

 divided into two equal and similar parts, at the 

 same time disclosing a central transparent body 

 within each spherule. The segmentation of the egg 

 continued: the primary halves divided by a con- 

 striction forming on a plane transverse to the origi- 

 nal plane of separation, thus forming four units; 

 the quartet in turn divided likewise to form an 

 octet, and this process of division was repeated 

 until I could no longer trace the continuity or 

 count the number of the cells. All remained con- 

 tiguous and flattened against one another. 



Now these repeated divisions, besides increasing 



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