LIMACID &. 79 
gested for species of Limax, founded mostly on the peculiarities 
of the mantle, genitalia and ‘lingual dentition: Hulimax, Agrio- 
limax, Milax (Gray), Amalia, Lehmannia, Limacus (Lehmann), 
Krynickellus, Krynickia, Heynemannia, Plecticolimax, Hydro- 
limax, Lallemannia (Mabille), Malino (Gray), Malinastrum, 
Gestroa, Chromolimax, Opilolimax, Stabilea, Malicolimax, Mega- 
pelta (Morch), Clytropelta, Ibycus. 
AMALIA, Moquin-Tandon, 1855. (Milax, Gray, 1855.) Mantle 
more or less rugose, no concentric striz ; tail strongly carinated ; 
shell-plate with median nucleus. LZ. Sowerbyi, Fer. 
EULIMAX, Moquin-Tandon. Mantle with more or less distinct 
concentric striz, no rugosities. JZ. alpinus, Fer. (ci, 56).  L. 
gagates, Drap. (ci, 58). 
MALINO, Gray. Back keeled; dorsal shield large, front half 
concentrically, hinder longitudinally furrowed, very contractile, 
very mobile, moving rapidly from side to side as the animal 
walks. J. lumbricoides, Morelet. 
KRYNICKIA, Kalenicz. Shield very large, only adhering behind; 
body slender; respiratory orifice on the right posterior margin 
of the mantle. L. brunneus, Drap. Megapelta, Mirch, a Cen- 
tral American group, is very similar. L. semitectus, M irch. 
PARMACELLA, Cuv., 1805. 
Syn.—Girasia, Drusia, Gray (part). 
Distr.—Around Mediterranean, Canaries, Central Asia. P. 
Valenciennesi, Webb (c, 41). 
Animal limaciform, subcylindrical, swollen behind, gradually 
attenuated before; tentacles simple; mantle large, central, con- 
cealing the shell; no longitudinal furrows above the margin of 
the foot, and no caudal mucous pore; distinct locomotive disk ? 
external respiratory and anal orifices at the right posterior mar- 
gin of the mantle; orifice of the combined generative organs 
behind and below the right eye-peduncle. 
Shell small, testaceous, internal, rudimentary, subspiral, aper- 
ture very large, dilated anteriorly. 
Jaw smooth, with a median projection. Lingual membrane 
with tricuspid centrals, first laterals tricuspid also, marginals 
aculeate. 
The young animal is entirely enclosed in the shell, which is 
furnished with a sort of operculum. As the animal grows the 
operculum falls, the shell becomes covered with the mantle, and 
only increases at its outer margin, like the simple shell-plate of 
Limax. 
CRYPTELLA, Webb and —— 1833. Canary Islands. Shell 
less distinctly spiral. 
During eight or nine seaanbae in the year their vital activity is 
suspended, and they remain concealed under the large blocks of 
