of a new Species and Variety of Arion. 253 
either side of the body a narrower light brown band borders 
the median one, and this in turn is bounded by another dark 
vandyke-brown band about half the breadth of the median 
one. The sides of the body and the foot-fringe are of a light 
brownish white, the latter being striped with faint s sepla lines. 
The sole is pale yellow. The - ruge are somewhat oval and 
flat, separated by deep sulci. The caudal gland is small and 
inconspicuous. 
The alimentary and nervous systems agree very closely 
with the condition found in A. empiricorum, Fér.; there are 
some slight modifications, however, in the form, position, and 
branching of the buccal nerve e and a number of minor modifi- 
cations in the muscular system, in both of which features 
it differs from any known species. Individually, however, 
I am not inclined to attach much importance to these. The 
differences in the generative system are the best marked 
and such as to at once indicate its specific identity. There is 
a large single vestibule ; the upper portion of the receptacular 
duct is greatly enlarged, but it cannot at all be regarded as a 
second vestibule. ‘The sperm-duct is a moderate-sized taper- 
ing organ continued as the vas deferens, which is noticeable 
on account of its length. The receptacular duct commences 
as a much dilated tube, tapering to a small and short duct 
which opens into a large oval-shaped sac—the receptaculum 
seminis. There is a large muscle attached to the distal end 
of this organ (PI. IX. fig. 2, 7.s. and r.m.). The oviduct is 
exceedingly large and usually exhibits a series of more or less 
well-developed constrictions; where this large proximal 
portion joins the distal portion of the free oviduct there is a 
small flagellum, to which a muscle is attached. This muscle 
originates from the right body-wall, posterior to the peri- 
cardial cavity, and, as well as being attached to the oviduct, 
is continued forwards and attached to the upper portion of 
the receptacular duct. The oviduct and prostate are much 
convoluted, and in all the specimens dissected were found to 
have a position quite different to that found in any other 
members of the genus as far as | am aware. On turning 
back the body-wall from the left side, the large albumen- 
gland is noticed lying over the oviduct and prostate, these in 
turn lying over the free oviduct, sperm-duct, vas deferens, &c. 
The albumen-gland is exceptionally large, as is also the her- 
maphrodite gland, which is of a deep slaty-purple colour ; it 
opens into the hermaphrodite duct, a long convoluted tube. 
It will readily be seen that A. flagellus differs in a number 
of well-marked anatomical characteristics from any other 
known species. It may, I think, be regarded as a form inter- 
Ann. & Mag. N. Hist. Ser. 6. Vol. xii. 20 
