REPRODUCTIVE SYSTEM. 



355 



a large number of spermatozoa, and is transferred by the 

 penis into the genital aperture of another snail. 



(/) Continued from the oviducal side of the common 

 duct, there is a separate ciliated oviduct. This has a short 

 course, and ends in the common genital aperture. Before 

 it reaches this, however, the oviduct is associated with two 

 structures. The first of these is a long process, as long as 

 the common duct, beside which it runs, in appearance 



h.d. 



R 



d.g. 



m.g, 



FIG. 115. Dissection of Helix pomatia. 

 LEU CK ART.) 



(Mainly after 



n.r., Nerve ring ; s.g., salivary glands on the crop \f., foot ; d.g., 

 digestive gland opening into mid gut ; h. heart; k. kidney ; r., rectum ; 

 R. hermaphrodite organ in terminal part of digestive gland ; h.d., 

 hermaphrodite duct; a.g. , albumen gland ; c.d., common duct, with 

 more convoluted oviducal part ; v.d., vas deferens entering penis; 

 _/?., flagellum ; r.s. receptaculum seminis, with a branch from its 

 duct ; m.g.) mucus glands ; d.s., dart sac. 



suggesting the flagellum, but expanding at its free end into 

 a globular sac the receptaculum seminis. It is into this 

 long duct and sac that a spermatophore from another snail 

 passes, and is after some days dissolved, liberating hundreds 

 of spermatozoa. By these spermatozoa the ova of this snail 



