$?7 



left, the delicpte tubo of r^erinarc PT'ity. 



SUMIv^ARY. 



1. Tho effps are Inid at a rfir:ular ti-e, about fivp 

 o'clrck ir the rorni'p. They are set free by the brealrinp 

 down of the cithelial layer of the ovaries. 



2. The pgff is s-^herical ard -easures .14 Tn". in diaineter. 

 It is destitute of a -e'^brane v;hen laid, ard nore is subse- 

 cuertly develrred. The oytorlasr is dense a•^d oraoue, 



3. iVaturation takes T)lace after the epps are laid; ard 

 fertil izatior takes nlace very soon. Eetails of fertilization 

 could not be Tade out because of opacity of pg?s . 



4. Cleavage is total, ecual ard '^early repular, es-r^ecial- 

 ly ir the e?rly stapes. Frctclasric threads or bridges , ccr- 

 '-ectirp the differert blastoneres durir.p the early cleavapes, 

 are frecuently encountered. The sepTe^tinp cells arranpe 

 themselves arcurd a coi^tirually enlarpinp cleavape cavity. 



B. At the co^rletio' of the sep-^entatior a true blastula 

 is forred, v/hich develcrs cilia a-d sv/irs with a spiral 

 rotion. 'Ihe oval blastula elrnpates and is transferred into 

 mlanula. 



