Hurron,—Description of some new Slugs. 881 
Art. XXXVI.— Description of some new Slugs. By Prof. F, W, Hurron. 
[Read before the Otago Institute, 26th November, 1878.] 
LIMAX MOLESTUS, 
Mantle short and flatly rounded behind, smooth and sub-concentrically 
wrinkled when alive, rugose and not wrinkled in spirit. Pulmonary 
opening in the posterior third of the mantle; back rounded behind the 
mantle, pointed and keeled posteriorly ; body with irregular longitudinal 
rib-like protuberances; colour variable—greyish or reddish-brown variously 
marbled with dusky. Tentacles of the same colour as the back; foot 
yellowish-white. Length, about 1} inches, Shell slightly concave. A 
rather common variety is quite black. 
Dunedin, Wellington, ete. Abundant everywhere. 
The radula has 88 rows of rachis teeth, and about 20 on each side of 
lateral teeth. 
This species is closely allied to L. agrestis of Europe, but is larger, the 
keel is not oblique, the pulmonary opening is placed more posteriorly, and 
the ovo-testis is more elongated. In Dr. Knight’s paper on the Bitenta- 
culate Slug of New Zealand (Trans. Lin, Soc, XXII., p. 381) figures 8, 11, 
12, and 15 belong to this species. 
MILAX EMARGINATUS. 
Mantle slightly shagreened, short and emarginate behind ; pulmonary 
opening a little behind the centre. A depressed line runs from this opening 
forward over the back, and backward again to a point on the left side 
opposite the pulmonary opening. Back sharply keeled up to the mantle ; 
body smooth, with depressed lines radiating from the mantle. Colour dark 
grey or olive above; foot and lower sides of the body yellowish-white. 
Length 1 inch. Shell small, nearly flat; length 08 inch. 
Dunedin; common in gardens, etc. 
Distinguished from M. antipodarum by the shape of the mantle and 
smooth body. I have M. antipodarum from Wellington. The radula has 
27 rows of rachis teeth, and about 25 on each side of lateral teeth. The 
transverse rows are curved, the convexity being in the direction of the 
apices of the teeth. 
ÅRION INCOMMODUS. 
Mantle rugose, short and rounded behind; pulmonary opening in front 
of the middle; back rounded, not pointed posteriorly ; colour dark lead- 
grey, a lateral stripe on the mantle, and a longitudinal band on each side, 
black; sometimes the whole upper part of the body greyish black; foot 
yellow. Length 1 inch; shell rudimentary. 
Dunedin, Not uncommon in gardens, etc, 
