82 



smaller and losing its convolutions. This narrow portion of 

 the duct passes almost completely around the neck of the sper- 

 matocyst, until directly posterior to it (fig. 22, Plate IV). Here, 

 the hermaphrodite duct divides into two portions, sperm duct 

 and oviduct. The sperm duct turns sharply forward, crosses 

 the neck of the spermatocyst, and finally enters the latter upon 

 its anterior surface close to the junction of the spermatocyst 

 with the sperm-oviduct (text figure 5). The oviduct passes 

 dorsad over the posterior surface of the neck of the mucous 

 gland and leads directly into the convoluted tube seen on the 



dorsal side of the anterior gen- 

 ital mass (fig. 23, Plate IV). 

 This can then be traced into 

 the broad white coils which 

 form the structure commonly 

 called the albumen gland, 

 which as a matter of fact is no 

 more than a specialized por- 

 tion of the oviduct. The al- 

 buminogenous portion of the 

 oviduct is flattened trans- 

 versely, the lumen being a hori- 

 zontal slit which extends almost 

 completely across the tube. 

 The wall of the outer edge of 

 the duct remains thin, form- 

 ing a well-marked conducting 

 channel. The dorsal and ven- 

 tral walls of the glandular 

 part of the duct are produced 

 internally into thin, closely 

 packed, transverse lamellae, to 

 which the considerable appa- 

 rent thickness of these walls is due. The proximal end of the 

 albuminogenous portion of the oviduct is thin-walled and differs 

 conspicuously from the remaining portions by the racemose 

 condition of its wall. The wall of this part, moreover, is quite 

 thin and bears no internal lamellae. The oviduct finally opens 

 into the right, or oviducal, side of the sperm-oviduct (text 

 figure 5) . 



The mucous (nidamental) gland is visible only on the ventral 

 surface of the anterior genital mass. It is a brown body, 

 roughly triangular in outline, occupying the central part of the 



Fig. 5. — Diagram of the reproductive system 

 of Adesia freeri sp. nov. 1, vulva ; 2, 

 copulatory recess ; 3, spermatocyst ; 4, 

 mucous gland (nidamental gland) : 5, 

 proximal portion of oviduct : 6, albumi- 

 nogenous portion of oviduct (albumen 

 gland ) ; 7. hermaphrodite gland ; 8, her- 

 maphrodite duct : 9, ovarian portion of 

 sperm-oviduct ; 10, spermatic portion of 

 sperm-oviduct ; 11, spermatheca. 



