68 
ARIONIDiE. 
mantle shield-llke^ simple, anteriorly ovate, 
granular; the orifice of the generative organs 
is immediately under the respiratory aperture ; 
subcaudal gland transverse, horizontal. The 
jaw narrow, striated in front, and crenulated 
on the edge (fig. 26.). Shell distinct, oblong, 
sometimes only spongy, or only a few granules 
in the substance of the mantle. 
The eggs separate, covered with a hard calcareous 
shell. They lay about 70 or 100. They vary from 
twenty-five to forty days in hatching, and the ani- 
mals attain their full growth in a year, but they 
begin to deposit their eggs a month or two before 
that period. 
a. Shell none^ or hemispherical and spongy, (Lochea.) 
13. 1. Arion ater. Black Arion.— Tentacles black ; 
the side of the foot marked with transverse 
black lines ; body with interrupted longitudinal 
grooves ; shield minutely granular ; shell spongy, 
hemispherical (fig. 28.). 
Avion ater. 
Limax ater. Linn. Faun. Suec, 507 . ; Muller, Verm. 2. ; Drap. 
122. t. 9. f. 3 — 6. ; Sturm, Faun . ; Nwineley, Trans. Phil. 
Soc. Leeds, 46. t. I . f. 1. t. 2. f. 1. t. 3. f. 1. 3 — 6. t. 4, & 5. 
f. 1. — Limax rufus. Linn. F, Suec. 507 . ; Razoum . ; Drap. 
