254 GEOMALACUS MACULOSUS. 
in colour, sometimes with indistinctly indicated darker subdorsal and lateral bands, 
which usually extend the whole length of the body, and are due to the body 
being overspread by numerous somewhat oval yellowish spots, which are, however, 
distributed more or less perceptibly in five longitudinal zones ; SHIELD about one- 
third the length of the body when crawling, but only about half size when the 
animal is contracted, rounded in front and bluntly pointed behind, shagreened and 
spotted with somewhat similar but more uniformly distributed pale buff or whitish 
spots than those on the body ; FOOT-FRINGE not very distinctly separated, very pale 
and somewhat expanded, with indistinct lineolation ; SOLE pale dusky-ochreous, 
indistinetly trifasciate, with the mid-area somewhat darker and more transparent 
than the sides; CAUDAL GLAND triangular, not very conspicuous, opening trans- 
versely between the foot and the body, and often carrying a transparent yellowish 
ball of slime; UPPER TENTACLES smoky-black or grey, short and thick, but with 
oval extremities, and bearing the usual eye-specks at their summits ; LOWER 
TENTACLES pale translucent grey. 
DERMAL-MUCUS usually pale-yellow and variable in its degree of viscosity. 
LocOMOTORY-MUCUS tenacious and usually colourless, but may be stained by the 
intermixture of the dermal slime. 
SHELL resembling that of Limaz, of an oval 
shape, solid and calcareous, with a transparent 
conchiolin base, usually somewhat convex above 
and coneave beneath, with a few indistinet con- 
centric lines of growth, and, according to Godwin- 
Austen, covered outwardly with a very thin trans- 
parent epidermis and with the boss or nucleus near 
the front. Im young animals, the shell is very thin 
and convex, abruptly eut off behind, but with a 
projecting granular film in front. 
Fic. 259.-—Shell 
of G. maculosus 
x 6. 
(Lough Caragh, 
Co. Kerry, R. F. 
Scharff). 
INTERNALLY, the ALIMENTARY CANAL resembles 
that of Arion ; the HEART is completely surrounded 
by the triangular renal organ or KIDNEY, which is 
of lamellate structure, and discharges by means of 
a primary and secondary URETER; in the present 
group the ventricle of the heart is directed towards 
and in close proximity to the ANAL and RESPIRA- 
TORY ORIFICES, while in Arion it is more remote 
and in a more posterior position ; the SUPRA- 
PEDAL GLAND is deeply imbedded in the tissues 
and reaches far back; SEMPER’S ORGAN is well 
developed and chiefly shown as a pair of strong 
flattened lobes; the SALIVARY and DIGESTIVE 
GLANDS are as in Avion, but the vestigial osph- 
radium within the mantle chamber is more distinct. 
Fic. 260.— 
Brain-ring of G. 
maculosus, from 
beneath, enlarged 
(after Scharff). 
The CEPHALIC RETRACTORS have the typical 
Arionine character ; the right and left TENTACULAR 
muscles divide early for the upper and lower 
tentacles, but only those of the ommatophore are 
darkly pigmented, and are attached basally to the 
right and left posterior mantle margins respec- 
tively; the PHARYNGEAL retractor is, as usual, 
fureate for attachment to the rear of the BUCCAL 
BULB, its root being fixed on the right-side of the 
body, just behind the point of fixation of the right 
tentacular muscle. 
Fic. 261.—Pallial organs and 
cephalic retractors of G. maculosus 
The REPRODUCTIVE ORGANS possess a small, Meee Ges SS) 
compact, and darkly pigmented OVOTESTIS, and the h. eee oe) 3 ee Zt. at 
<P > SE pt ae ae ge poe a2 entacular retractor; #. right 
HERMAPHRODITE ‘DUCT is very long and greatly © jentacular retractor: +. rectum: 
convoluted, terminating in a small spherical VESI- 4... pharyngeal retractor. 
CULA SEMINALIS; the ALBUMEN GLAND is elong- 
ated and linguiform; OVISPERMATODUCT also very much twisted ; the FREE OVI- 
pucv rather long and thin, but without any enlargement ; VAS DEFERENS very 
long, complexly twisted, and rolled up in the form of a bundle; SPERMATHECA 
globular, with short stem, but quite distant from the genital aperture, owing to 
