LIMAClDiE. 19 



gested for species of Limax, founded mostly on the peculiarities 

 of the mantle, genitalia and lingual dentition : Euliniax, 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 striie ; tail strongly carinated; 

 shell-plate with median nucleus. L. Sowerhyi, Fer. 



EULiMAX, Moquin-Tandon. Mantle with more or less distinct 

 concentric striae, no rugosities. L. aljnnus, Fer. (ci, 56). L. 

 ^agates, Drap. (ci, 58). 



MALINO, Gray. Back keeled ; dorsal shield large, front half 

 concentrically, hinder longitudinally furrowed, very contractile, 

 verj^ mobile, moving rapidly from side to side as the animal 

 walks. 31. lumbricoides, Morelet. 



KRYNICKIA, Kalenicz. Shield very large, only adhering behind ; 

 body slender ; respiratory orifice on the right posterior margin 

 of the mantle. L. brunneua, Drap. Megapeita, Morch, a Cen- 

 tral American group, is very similar. L. semitectas, Morch. 



Parmacella, Cuv., 1805. 



Syn. — Girasia, Drusia, Gray (part). 



Bistr. — 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 3^oung 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 Bertholet, 1833. Canary Islands. Shell 

 less distinctly spiral. 



During eight or nine months in the year their vital activity is 

 suspended, and they remain concealed under the large blocks of 



