THE OVARY AND THE EGGS. 



131 



during the breeding season than at other times ; the large 

 brownish-yellow eggs become conspicuous in the ovary, 



Fig. 32.— Astacus fliiviatilis. — 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 ; 

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

 v, vitellus ; vm, vitelline membrane ; w, stalk of ovisac. 



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

 period. 



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



