THE OVARY AND THE EGGS. 



131 



during the breeding season than at other times; the large 

 brownish-yellow eggs become conspicuous in the ovary, 



ep 

 v.m 



Fig. 32.~Astacvsfliiviatilis.^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 ; ep, epithelium of ovisac ; 

 ffs, germinal spots ; f/r, germinal vesicle ; m, membrana propria ; 

 V, vitellus ; i-m, vitelline membrane ; n-, stalk of ovisac. 



and the testis assumes a millv- white colour, at this 

 period. 



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



