THE OVARY AND THE EGGS. 



131 



during the breeding season than at other times; the large 

 brownish-yellow eggs become conspicuous in the ovar}^ 



Fig. o2. — Astacu-sJlifviat'dis. — A, a two-thirds grown egg- contained in 

 its ovisac ( x 50) ; B, an egg removed from the ovisac ( x 10) ; 

 C, a portion of the wall of an ovisac with the adjacent portion of 

 the contained egg, highly magnified ; ej^, epithelium of ovisac ; 

 gs, germinal spots ; gv, germinal vesicle ; m, membrana propria ; 

 V, vitellus ; ivn, vitelline membrane ; w, stalk of ovisac. 



and the testis assumes a milk-wdiite colour, at this 

 period. 



The walls of the ovary are lined internally by a layer of 



