ARION SUBFUSOUS, 195 
The CEPHALIC RETRACTORS of this , oe 
species are arranged as in Avion ater; the bp 
TENTACULAR retractors are broad, and ” 
divide early for the ommatophore and Fic. 210.— 
lower tentacle; they are set obliquely, and re \)\ Cephalic retractors 
arise from seven to nine mill. apart, a little : uy V)\ of Arion subfuscus 
in advance of the hind margin of the shield \ i i MdGhaetcharcht 
on the posterior right and posterior left Yh Hants. S., Mr. C. 
side respectively ; the comparatively slender YA sé AA Sir). 
PHARYNGEAL retractor arises somewhat to LN 
the right of the median-line, a trifle he- y 
hind the mantle margin; it divides early : 
into two slender branches, which become fixed to opposite sides of the buceal bulb. 
The REPRODUCTIVE ORGANS display a sepia-brown and lobular OVOTESTIS, and 
a creamy-white HERMAPHRODITE DUCT, terminating in a distinct VESICULA 
SEMINALIS, which is grey, sometimes speckled with deep-brown ; the ALBUMEN 
GLAND is semi-transparent and gelatinous, indistinctly lobular, and of pale 
yellowish-grey colour; the ovipUCT is bluish-grey, broadly sacculate, bound to- 
gether in convolutions, and showing a flesh-coloured ruftle at the base of the 
albumen gland, which has the aspect of semi-gelatinous tubing, recalling the vesti- 
bular glands of MWilax sowerbii; the SPERM DUCT is creamy-white above, much 
thickened and ochraceous below; the long, slender, and semi-transparent VAS 
DEFERENS passes into the opaque-white and tapering EPIPHALLUS, whose base is 
encircled by a conspicuous raised ring, and within which is formed the very long 
and serrate SPERMATOPHORE ; the large and globose SPERMATHECA is at maturity 
usually whitish, stiff, and hard, connected to the oviduct by tissue and small 
Fic. 211. Fic. 212. Fie. 213. 
Fic. 211.—Alimentary canal of A. subfuscus, with buccal bulb 
and nerve-ring, x 2 (Christchurch, Hants. S., Mr. C. Ashford). 
Vic. 212.—Sexual organs of A. sudfuscus, X 2. 
Fic. 213.—Portion of the sexual system of A. sv/uscus, show- Fic. 214. 
ing the vesicula seminalis, x 4. 
Fic. 214.—Spermatophore of 4. sw4/uscus, x 6, with magnified portions showing details of structure 
(after original drawing by Dr. Simroth). 
alb.g?. albumen gland; at. atrium; ef. epiphallus; 4.d@. hermaphrodite duct ; of. ovotestis ; ov. 
oviduct ; ~. retractor ; sf. spermatheca ; s.d. and sf.d. sperm duct ; v.s. vesicula seminalis. 
muscular strands especially at apex of vesicle, the stalk is rather short and greatly 
swollen basally, contracting where it joins the vesicle; the FREE OVIDUCT is at 
first comparatively simple and slender, but enlarges abruptly and characteristically 
in the latter part of its course, and shows internally a varied series of longitudinal 
thickenings ; the GENITAL RETRACTOR arises near the origin of the left tentacular 
retractor, and becomes fureate, one branch being attached to the stem of the 
spermatheca, and the other to the upper part of the swollen free-oviduct. In this 
species there does not seein to be any striking constriction of the ATRIUM, which 
is, however, invested by a well-defined yellowish glandular pad. 
The ALIMENTARY CANAL is triodromous, exhibiting the effects of the torsion of 
the viscera, and greatly resembling the intestinal canal of the juvenile Arion ater ; 
the G:SOPHAGUS is usually about three mill. broad, and of a whitish colour ; the 
