2IO M UN SON. 



Fig. 1 6. Portion of an ovarian tube taken from a living animal thirteen 

 inches long, and examined in the normal fluids of the ovarj', drawn with a camera; 

 a sharply defined granular zone surrounding the germinal vesicle, as in b., or 

 extended on the proximal side to the point of attachment of the eggs, as in c, 

 or collected into a dense body in the cytoplasm, as in a. 



Fig. 17. A portion of a mature egg in the ovarian tube, showing an opening 

 in the chorion, and some distance below it the last remnant of the nucleus in the 

 form of a spindle, the laminated structure of the chorion, and also its radial 

 striations. 



Fig. 18. Structure of the egg membranes ; p.t., primary tunic, corresponding 

 to the tunica propria — the original egg membrane ; the first egg membrane fully 

 formed ; the second having the form of radial protoplasmic fibers ; the interfilar 

 substance not yet hardened into the definite chorion. The primary tunic shows 

 the bright dots — the original points of insertion of the radial fibers. 



