45 

 any definite snot for the entrance of the snerr-.atosoon or 

 not could not be decided. But I a- inclined to think thrt 

 the Tale ele-'^ent i.c capable of nenetratinp; the egp: at any 

 T^art; and that when it har once entered the substance of 

 the egp, the -ale and fe-ale pronuclei are brought to{?ethc.r 

 by the attraction existin.n; .tetwee-' the tv;o. 



It was i-^nossible to see the discharge of the sriernato- 

 zoa fro- the nales; neither did I see then enter the egps. 

 And, as stated before, the eggs are so onaoue that the inter- 

 nal nhenoTiena of fertilization could not be followed i-i the 

 living snecimens. s**4 The -^e is reason to believe that the 

 sner~s are discharged at about the sa-^.e tire that the ferales 

 lay -uheir eggs. Fertilization talces nlace in the v/ater ir.- 

 r?ediatoly follov;ing '-aturation, and segr^entn.tio- begins in 

 a ver ^ short ti-e. 



SEGMErlTATIOIi. 



Segmentation is total and an-'-roxinately equal. V.hile 

 there is a slight difference in the size of the blasto-reres 



