~~, 
328 HELIX HORTENSIS. 
The DART SAC, or stylophore, is small and subclavate in shape, and not fused 
to the vagina, white or whitish when immature, but livid purple or blue when 
sexually adult; the thick outer coat is of a purplish tint, except towards the base, 
the inner coat of a purplish-brown, the intervening space being filled by a dark 
pigmentary deposit ; BASAL TUBERCLE with a dark core and a white and probably 
calcareous tip. 
Fic. 376. Fic. 377. Fic. 378. 
The Gypsobelum or ‘‘Love Dart’ of Helix hortensis Miiller, showing an immature stage, the 
perfected weapon, and an enlarged section to more closely reveal its remarkable structure. 
Fic. 376.—Immature stage, showing the order of development of the blades, x 20. 
Fic. 377.—Gypsobelum or love dart, x 10. 
Fic. 378.—Section through lower third of the dart, x 20. 
The DART, or gypsobelum, is heterospathostylous! and about four mill. in length, 
curved in shape especially towards the apex, and gradually enlarging towards the 
base, furnished with four channel-edged blades, placed at right angles to each 
other, and destitute of the crescentie films between the blades, so characteristic of 
H. nemoralis; the blades originate abruptly a little above the basal expansion, and 
gradually diminish in size and prominence as they approach the apex, where they 
are first perfected, the expanded base and the annulus, which is constituted by four- 
teen to sixteen convex longitudinal rodlets, being formed later. 
The HEART shows a comparatively large and white ventricle and a smaller brown 
auricle, and is, as usual, placed alongside the renal organ or kidney. 
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H J Fic. 380. 
Fic. 379. 
The Reproductive, Respiratory and Alimentary organs of Helix hortensis. 
Fic. 382. 
Fic. 379.—Reproductive system, showing the general arrangement of its constituent organs. 
a.g. albumen gland; «.s. dart sac or stylophore; 77; flagellum; 4.¢. hermaphrodite duct ; #z.¢7. 
mucus glands; of ovotestis or hermaphrodite gland; osd. ovispermatoduct ; sf. spermatheca ; 
p- penis; 7. retractor. 
Fic. 380.—Vesicula seminalis and hermaphredite duct, showing their precise character, x 15. 
Fic. 381.—Pulmonary plexus, kidney and heart, x 2. & kidney; #. ureter; 7 rectum. 
Fic. 382.—Alimentary organs, x 2. 4.6. buccal bulb; s.g@Z. salivary glands; 7. rectum. 
The ALIMENTARY SYSTEM is triodromous? in intestinal arrangement, and shows 
an elongate (ESOPHAGUS, much longer comparatively than in H. aspersa, bluish- 
vrey in colour. and conspicuously marked by dark longitudinal lines ; the SALIVARY 
GLANDS an‘l their duets are also bluish-grey or slate-coloured, the glands being 
attached to the cesophagus and not, as is more usual, to the crop, which is of a 
dull ochreous colour. 
1 Monog. i., p. 369. 2 Monog. i., p. 284, . 567. 
a eee 
