REPRODUCTIVE SYSTEM. 



389 



duct towards the head along a common duct, but not at the 

 same time. Moreover, their paths are different, for the 

 portion of the duct down which the ova travel is much 

 plaited, while the path which the spermatozoa follow is a 



V.C 



FIG. 209. Dissection of snail. 



T., Short horn; TT., long horn with eye; N., cerebral ganglia; S.G., 

 salivary glands on the crop ; ^.,foot; M., columellar muscle; F.C., 

 visceral coil ; O.T. t ovotestis ; F., ventricle of heart ; R. rectum ; U., 

 ureter ; B.V.^ blood vessels returning_to_ the auricle from the mantle ; 

 /4., pulmonary aperture ; MA., edge of the mantle. 



less prominent groove, incompletely separated from the 

 other. Both paths are glandular, and the glands on the 

 male side are often called prostatic. 



(e) At the base of this common duct, a distinct vas 

 deferens diverges to the left and leads into a muscular penis ^ 



v 



