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AN ELEMENTARY TEXT-BOOK OF BIOLOGY. 



shaped organ imbedded in the inner side of the coiled right liver- 

 lobe. From it a much convoluted hermaphrodite duct proceeds. 



(2) Special Male Organs. The hermaphrodite duct splits as 

 it were into male and female ducts, or spermiduct and oviduct, 

 which convey the sperms and ova respectively. The spermiduct 



o-t 



Fig. 37. REPRODUCTIVE ORGANS OF SNAIL. o-t, Hermaphrodite gland ; 

 h.d, hermaphrodite duct; a.gl, albumen gland; v.d, spermiduct (vas 

 deferens); ov, oviduct; va and vs, upper and lower parts of vagina; 

 d.s, dart-sac; m.gl, mucous glands; g.o, genital opening; sp, spermo- 

 theca; sp' and sp" y left and right branches of ditto; p, penis; r.p, 

 retractor penis; /, flagellum. 



(vas deferens) is a narrow tube running at first along the side of 

 the much larger oviduct, the cavities of the two being incom- 

 pletely separated.* In this part of its course it is beset with 

 numerous small eminences collectively constituting a prostate 

 gland. Further forwards the spermiduct separates from the 



* The two together often receive in this region the name of COmmOU 



duct. 



