HELICIGONA LAPICIDA, 401 
The HEART is small, the auricle and ventricle are both of a dirty-white, and 
searcely distinguishable from each other by their colour. 
The PEDAL GLAND, according to M. André, shows anteriorly a wide and flat 
excretory canal, with well developed folds on the roof of the cavity, and the usual 
conformation of ribs and grooves, but the cilia covering the canal are very short, 
and the glandular part is reduced to a few cellules; in the median portion the 
secretory cellules are somewhat compactly arranged, but the neighbouring lacunar 
system is not important. 
The REPRODUCTIVE ORGANS show an 
ochreous OVOTESTIS, composed of loose 
follicles ; the HERMAPHRODITE DUCT thick 
and much convoluted, and blotehed with 
opaque-white ; the VESICULA SEMINALIS or 
claw long, apparently closely doubled-up 
and sometimes crenulated ; ALBUMEN 
GLAND narrowly linguiform, and of a dull 
amber colour ; OVIDUCT white and woolly ; 
SPERM DUCT pale ochreous; FREE OVI- 
pucr long and rather slender; PENIS 
SHEATH much distended towards the distal 
end; the RETRACTOR MUSCLE apparently 
attached near the base of the EPIPHALLUS 
and fixed at its root to the great muscle 
of the buccal mass; the FLAGELLUM is long 
and opaque-white, with two complete spiral 
twists at the base, and the spermatophore 
which is undoubtedly secreted therein, but 
is as yet unknown, will certainly partake 
of the same peculiar shape; the SPERMA. 
THECA which arises from the free oviduct 
is roundish, of a yellowish colour, and often 
veined with red, borne upon a long and Fic. 456. —Reproductive organs of Helicigona 
slender duet, with a stout diverticulum  /eficida (L.), x 2. 
or branch which is sometimes cleft at the ot. ovotestis ; A4.d. hermaphrodite duct ; fr 
. 3 . é : a prostate; v.d. vas deferens ; 77. flagellum ; e/. 
ae? but is sear cely ee long as the Si PELL epiphallus; Z.s. penis sheath; 7. penial retractor; 
thecal section, both branches being bound ov. sacculate oviduct ; sf. spermatheca ; d. its 
to the upper portion of the matrix by a diverticulum 3 m.g. digitate mucus glands; as. 
broad and richly vascular membrane. dart sac ; vag. vagina. 
The MUCUS GLANDS are two in number, from 9 to 15 mill. in length, slender and 
vermiform in shape, but not stiff or rigid, widest towards the distal end, and two 
or three times longer than the dart-sac, which is embraced between them. 
The DART-SAC or stylophore is long, slenderly cylindro-clavate in form, and of a 
semitransparent pearly-white at all ages ; the DART or gypsobelnm is 34 to 4 mill. 
in length, has a gently curved, slender, tapering stem, terminated by a much- 
flattened lanceolate head and a vradually expanded base. 
Fic. 457. Fic. 458. Fic. 459. 
The Muscular and Reproductive organs of Helicigona lapicida (L.). 
Fic. 457.—The gypsobelum or dart, with transverse section of head, x 6. 
Fic. 458.—The vesicula seminalis and the terminal portion of the hermaphrodite duct, x 10, 
Fic. 459.—The cephalic retractor and its branches. 
6. buccal retractor; c. great columellar muscle: / anterior pedal retractors ; @. retractors of omma- 
tophores; ¢. retractors of lower tentacles. 
12/2/12 Z 
