ARION HORTENSIS. Zila 
As Dr. Scharff has pointed out, it can be distinguished from similarly 
sized specimens of Arion ater by its dark colouring, the young of ater 
being usually light coloured, and the wrinkles longer and broader, while 
A. intermedius is readily separable by the possession of the peculiar little 
conically-pointed body wrinkles, which have earned for it the title of the 
“hedgehog snail.” 
INTERNALLY, this species is distinctly separated from its closest ally, 
A. circumscriptus, by the large globular spermatheca, and the extra 
long and almost uniform free-oviduct, a feature which distinguishes it 
also from the other species. 
Description.—ANIMAL of somewhat cylindrical shape, but dorsally depressed, 
about thirty mill. long when fully extended, of an uniform bluish-grey or slate-grey 
colour, darkest and almost black mid-dorsally, shading paler towards the foot, with 
a black lateral band, which is most indistinct at its lower margin, and extends the 
whole length of the body and shield; BODY TUBERCLES comparatively broad, and 
forming about twenty-four longitudinal rows at each side; SHIELD comparatively 
small and coloured like the body, rounded in front and broadly rounded behind, 
finely shagreened, with the lateral banding of the body continued as a somewhat 
lyre-shaped black banding, which arches over the respiratory orifice; HEAD dark, 
especially in front; NECK pale; OMMATOPHORES dark, due in great part to the dusky 
retractors ; SOLE not visibly tripartite, yellowish or orange ; FOOT-FRINGE similarly 
coloured, with slight transverse furrows which are sometimes faintly pigmented. 
DERMAL-MUCUS yellowish or orange coloured and very viscid, the caudal and 
locomotory mucus colourless, the latter stained by admixture with the yellow 
tegumentary slime. 
The SHELL is described, especially by Italian authors, as well developed and 
solid, but in our British specimens it is usually soft and gelatinous, and only dis- 
tinguishable by its colour, but hardens by exposure; occasionally, however, distinctly 
solid transparent stones may be found. 
INTERNALLY, the BODY CAVITY is of a slaty-blue colour, except above the foot- 
sole, which shows an ochreous tint, minutely spotted with white ; the SUPRA-PEDAL 
GLAND extends half the leneth of the body during repose, but during active move- 
ment it is only about one-third the total length of the whole body. 
The CEPHALIC RETRACTORS are broader and flatter " if Wi 
than in Lim«wr, bat of the usual Arion type. The g i) 
TENTACULAR muscles spring from widely separated ! Sigh % 
points, and the lower tentacular branch is’ strongly ay ta 
developed; the right tentacular muscle arises from \ f | 
the shield at the right margin of the kidney, while aE Ma 
the left muscle springs from a corresponding point 
on the left margin, their roots being thus separated \\ 
by the whole width of the kidney ; the PHARYNGEAL \ 
retractor arises from the dorsal skin on or to the right 
of the median-line, quite behind the lung, about three Fic, 222.—Cephalic retractors 
mill, posterior to the tentacular muscles, and is cleft of 474% Hortensis Eas 
about mid-way, for attachment to opposite sides of the buceal bulb. 
The ALIMENTARY SYSTEM is, as in all its congeners, triodromous, although not 
exhibiting a very pronounced spiral torsion ; the INGESTLIVE TRACT extends posteri- 
orly beyond the succeeding coils, and terminates in the true stomach; the 
(ESOPHAGUS is fused to the PHARYNX from its origin up to the CEREBRAL 
GANGLIA; the CRopP is voluminous, and pale brown in colour, with the whitish 
SALIVARY GLANDS attached to its sides; while the left lobe of the DIGESTIVE 
GLAND is, as is usual, directed backwards. 
The REPRODUCTIVE ORGANS show a roundish or oval OVOTESTIS, with few acini, 
and is often of a dark colour, especially between the lobules, where it is frequently 
of a deep purplish-black ; the pucT is whitish or yellowish, long and slender, but 
becoming thicker and somewhat convolute as it approaches the gelatinous and 
greyish ALBUMEN GLAND ; the OVIDUCT is sacculate and white, closely attached to 
the SPERM DUCT which on separation forms a short VAS DEFERENS; the FREE 
OVIDUCT is of great length and usually slender, except at the base, it is often, 
before distention, doubled upon itself in an S-like form; the EPIPHALLUS is short 
and conical, white basally, ringed above with dark grey, and merges almost 
