IGO 
HELIX — REPRODtJCTIYE ORGAXi?. 
The Reproductive organs of Helix aspersa, like those of the 
Piihnonata generally, are of a hermaphrodite or monmcions character, 
hut this hermaphroclitisin does not normally affect the necessity for 
reciprocal union to ensure the fertilization of the ova. 
The Ovotestis or Hermapihrodite Gland, the essential constituent 
of the system, is lodged in the posterior lobe of the liver near the 
Fig. 323. — Reproductive organs of Helix nspcrsn dissected out and isolated. Tlic penis sheath, 
stylophore, uterus, atrium and vagina opened up— the penis sheath to show the inlromittent organ ; 
the stylopliore, tlie contained dart ; and the uterus, its sacculate structure. 
all\ gL allnimen gland ; d. dart in situ \ d.s. <lart sac or stylophore ; cp, epiphallus nagellum ; 
h.d. hermaphrodite duct ; ni.gl. mucus glands ; ot. ovotestis or hermaphrodite gland ; /. penis ; 
p.s. penis sheath ; pr. prostate or sperm duct ; p.r. retractor muscle of penis sheath ; sp. sperma- 
iheca; sp.d. spermatheca duct with thick ca^cal diverticulum; 07<. uterine portion of ONiduct ; 
v.d. vas deferens ; v.s. seminal vesicle or claw. 
apex of the shell, and is constituted by an aggregation of converging 
digitate -whitisb lobules, on whose internal walls the female and male 
elements, distinguished as the Ova and the Spermatozoa originate, 
the former as rounded and sei)arate cells, which continue their 
development, adherent to the follicular walls ; while the spermatozoa 
are filiform bodies with enlarged heads, usually aggregated in clusters. 
