Development of Reproductive Organs 137 



occupy a position on the ventral surface of the larva 

 exactly corresponding to that of the rudiment which in 

 the female gives rise to the seminal receptacles, but the 

 connexion of the supposed anterior genital rudiment 

 with the male ducts has not been satisfactorily ascer- 

 tained, and is somewhat difficult to understand. 



Fig. 103. — Develojjment of female 

 organs within tlie larva a^ seen in the 

 eleventh and twelfth segments (side 

 view), r, rudiment of spermatheca. 

 r', rudiment of gluten-gland. From 

 living larva. 



Fig. 104. — Development of 

 female organs within the 

 larva. More advanced than 

 fig. 103. )•, rudiment of spei'- 

 matheca. r', rudiment of 

 gluten-gland. u, vulva. 



From living larva. 



The female reproductive appendages develop within 

 the larva as thickenings and invaginations of the ventral 

 epidermis. From rudiments in the eleventh segment are 

 derived the spermathecae, while a similar ingrowth in the 

 twelfth segment gives rise to the unpaired gluten-gland. 



