thi day the epithelin.1 <tells are l^ns distinct* Cm the 

 tenth clay (fig. 9), the embryo has attained a ship* which 

 is somewhat li>*e thnt of a fully developed rairacidiuin, 

 the nucli of the epithelial oells are less distinct and 

 the oily globules are fewer but larger in size* On the 

 eleventh day (fig. 10), Die ambry o is still longer and on 



the posterior end a tail -like structure appears which 



<*r> t .. 

 possibly represents the region of the primitive germ 



balls* This projection disappears in a few days* The 

 fir-t movement of the embryo In also to ba sean on this 

 day, which consists of contraction and expansion at the 



anterior end. On the twelfth day (fig. 11 ). the movement 



l .*' dr&L ??&;< 

 increased, while the muscular nature of the bocty 



. . l , %r :' -."it; ti>>rt Of 



wall ha* be^some evident. The oily globules are still 



A* ' -v 



few^r in number yet larger. At the end of two weeVs 

 (fig* 12), germ balls oan be seen at the posterior end 

 of the embryo fairaoidium, while the activity has still 

 further increased. On the sixteenth day (fig* 13), the 

 embryo is nearly as lon& is the egg, the eye spot has 

 appeared and more g^rm balls are visible. 3tor the first 



& r< f : 



time flame cells are to be seen. They are two in number, 



' "' 

 one being raore anterior than the oth^r. Also the primitive 



digestive tra--t is visible* on the seventeenth day (fie- 

 the germ balls have increased to about twelve or fifteen 

 in number, th primitive digestive tract ie more clerxrly 

 outlined, the epithelial oells are oecoming quite opaque 



and thus the flrae oells can hardly be seen. The activity 



beyond 



of the miraeidiura has also greatly increased / that of the 

 previous day. On the twentieth day (fig. 15), the embryo 



