530 THE AMERICAN NATURALIST [Vol. LV 



mesonephric blastema at regular distances, fill the cavity 

 as shown in Figs. 1 and 2. 



2. The Ovarij. — The o\'ary is ronucd by direct develop- 

 ment from the indifferent gonad. In consecjiience of a 

 rapid increase of the germ cells by mitotic divisions the 

 germinal epithelium thickens. In larvtc of 30-35 mm. 

 total length the germ cells begin to be arranged in ovo- 

 cysts. After a few simultaneous mitotic divisions the cells 

 of the cysts enter the maturation stages. As Fig. 3 

 shows, the first cysts ai'e found in the distal part of the 



rxri^ liaxin- i.a^MMl ihroui 

 tion (>ynize>i>. U"i)t<.tcu.-, 

 follicle cells and now oritur 

 The nucleus increase^ coti^ 

 growing protoi)lasm iiuiiicr 

 (Fig. 7, sec. Oc). Yolk 

 before the third or foni th 

 greater im])ortance only in 

 testicuhu- ititerstit iuin :md 

 the o\:.r> r;u-n cnnl 

 1 sliou->, a little ^lit may a 

 entiated gland. More su 



