TEBENNOPHORIDiE — ARIONID^. 83 



rsEUDOMiLAX, Bottger, 1881. Differs in its mantle, being free 

 in front and on the right side ; genital orifice on the riglit side 

 of the neelv. Jaw and radula not observed. No internal shell ? 

 F. Lederi, Bottger. Caucasus. 



AspjDiPORUS, Fitzinger, 1833. 

 Like Limax, with perforated mantle. 



Family TEBENNOPHORID^. 



Animal naked. Mantle covering the entire bade. No mucous 

 pore ; jaw oxygnathous ; lingual dentition similar to Helix. No 

 shell. 



Tebennophorus, Binn., 1842. 



Syn. — Incillaria, Bens., 1842. Megimathium, Van Hasselt, 

 1824. Philomycus, Raf.,1820. 



Distr. — Asia, North and Central America. T. Carolinensis^ 

 Bosc (ci, 52 ; iii, 44). United States. 



Animal limaciform, cylindrical, blunt before, slightly atten- 

 uated behind ; tentacles simple ; mantle covering the whole back ; 

 no longitudinal furrows above the margin of the foot, and no 

 caudal pore ; no distinct locomotive disk ; external respiratory 

 and anal orifices near the head, somewhat to the rear of the right 

 eye-peduncle ; orifice of combined genital system behind and 

 below the right eye-peduncle. 



Shell or shell-plate none. 



Jaw smooth, with median projection. 



Lingual membrane long and narrow, centrals and first laterals 

 unicuspid, outer laterals bicuspid, marginal teeth quadrate. 



PALLiFERA, Morsc, 1864. Jaw ribbed. P. doisalis, Binney. 

 United States. 



Family ARIONID^. 



Animal naked, with or without mucous pore ; mantle concealing 

 a shell-plate, or a few calcareous grains which represent it ; jaw 

 strongly ribbed ; central tooth tricuspidate,the median cusp long 

 and narrow, laterals and marginals bicuspidate. 



Arion, Fer. 



Syn. — Prolepis and Lochea, Moquin-Tandon, 1855. Baudonia, 

 Mabille. Kobeltia, Seibert. ' 



Difitr. — Europe, Northern Asia and Africa. A.fuscatus, Fer. 

 (ci, 53). 



Animal limaciform, subcylindrical, attenuated behind ; ten- 

 tacles simple ; mantle small, anterior, concealing calcareous 

 grains, sometimes agglomerated into a shelly plate ; longitudinal 

 furrows above the margins of the foot, meeting over a caudal 



