SLUGS, 
71 
mites ; but they seem never to be at rest, moving 
with the greatest rapidity. A striking feature 
in the history of the little animal is that it 
appears to take np its abode within the inte¬ 
rior of the slug; effecting an entry by means 
of the respiratory aperture, and coming forth 
occasionally to ramble over the surface of the 
body. The slug does not appear to suffer any 
inconvenience from these parasites, and even 
allows them to run in and out of the lateral 
orifice without betraying the slightest symptoms 
of irritation. Arion ater has a wide geographical 
range. 
Arion hortensxs —(the Garden Avion Slug) 
(PL V., fig. 29)—differs from the last species ; 
it is much smaller and more slender, and is 
provided with grey longitudinal stripes. The 
foot is bordered with orange. The imperfect 
shell is more compact than that of A. ater. 
The horny jaw (fig. 11) is arched, .—^ 
strongly ribbed, and its margin ^ 
crenulated ; it contrasts strongly Fig } Y _ Jaw of 
with the smooth rostrated jaw of Shortens™. 
Limax (see fig. 12). 
Like the last species, it is common in woods, 
damp hedges, and gardens. The eggs of this 
species are said to be phosphorescent for the 
first fifteen days after they have been laid. 
