TEBENNOPHORIDA—ARIONIDA. 83 
PSEUDOMILAX, Bottger, 1881. Differs in its mantle, being free 
in front and on the right side; genital orifice on the right side 
of the neck. Jaw and radula not observed. No internal shell ? 
P. Lederi, Bottger. Caucasus. 
Aspipiporus, Fitzinger, 1833. 
Like Limax, with perforated mantle. 
Famity TEBENNOPHORID &. 
Animal naked. Mantle covering the entire back. 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. 7’. Carolinensis, 
Bose (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, Morse, 1864. Jaw ribbed. P. dorsalis, Binney. 
United States. 
i Faminy ARIONID 4. 
Animal naked, with or without mucous pore ; mantle concealing 
a shell-plate, or a few caleareous grains which represent it; jaw 
strongly ribbed ; central tooth tricuspidate, the median cusp long 
and narrow, laterals and marginals bicuspidate. 
ARIoNn, Fer. 
Syn.—Prolepis and Lochea, Moquin-Tandon, 1855. Baudonia, 
Mabille. Kobeltia, Seibert. 
Distr.—Kurope, Northern Asia and Africa. A. fuscatus, Fer, 
(ci, 53). 
Animal limaciform, subecylindrical, 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 
