ARIOLIMAX.—PHILOMYCUS. — B45 
ARIOLIMAX. 
Ariolimax, Mérch, Malak. Blatt. vi. p. 110 (1860) ; Binney, Land and Freshw. Shells N. Am. i. 
p- 278; Man. Am. Land-Shells, p. 92. 
Slug-like, with a mucous pore at the extremity of the body, and a flat, calcareous, 
oblong (not spiral), somewhat asymmetrical shell within the mantle. Pulmonary 
orifice at the posterior third of the mantle, with a cleft on its right margin. Jaw 
slightly arcuated, with strong ribs. Teeth of the radula subquadrate ; median large, 
with long median cusp; laterals with two cusps, the inner one longest; marginals 
aculeiform. [Binney, Ann. Lyc. N. York, x. p. 297, t. 13. fig. 1 (1873).] 
Differs from the European Arion in the presence of an internal shell. 
Confined to the west coast of North and Central America. 
1. Ariolimax costaricensis. 
Ariolimax californicus, subsp. costaricensis, Cockerell, Ann. & Mag. Nat. Hist. (6) vi. pp. 278, 279 
(1890) *. 
Dark olivaceous, back well keeled behind. Length 68, breadth 17; mantle 27 millim. 
flab. Costa Rica (Janson, in Mus. Brit. *). 
Very near A. californicus, Cooper. 
PHILOMYCUS. . 
Philomycus, Rafinesque, Annals of Nature or Annual Synopsis, i. p. 14, ed. Binney & Tryon, p. 64 
(Philadelphia, 1820) ; Férussac, Tab. Syst. Moll., Prodr. p. 14 (1821); Stoliczka, Journ. 
Asiat. Soc. xlii. 2, p. 29 (1872). 
Tebennophorus, Binney, Bost. Journ. Nat. Hist. iv. p. 163 (1842) ; Land and Freshw. Shells N. Am. 
i. p. 295; Fischer & Crosse, Miss. Scient. Mex., Mollusca, i. p. 183. 
Mantle extending over the whole length of the body, so that it is not distinct from 
the general dorsal surface, without keel. Pulmonary orifice on the right side, in the 
foremost part of the mantle. Jaw arched, slightly striated, with median prominence. 
Teeth of the radula subquadrate ; median one-cusped, with a very small lateral cusp on 
each side in some species; laterals two-cusped, external cusp much shorter than the 
inner one. . . 
Geographical distribution : North and Central America, Japan, China, India, Java. 
I agree with the late Dr. Stoliczka that Rafinesque’s description clearly designates 
this genus, the supposed absence of mantle being nothing more than its extension over 
the whole length of the animal, so that it cannot be regarded as a distinct portion of 
the animal, which is the case in the mantle (shield) of Limaz. 
1. Philomycus sallei. 
Tebennophorus sallei, Crosse & Fisch. in Journ. de Conch. xvii. p. 190 (1869)'; Miss. Scient. Mex., 
Mollusca, i. p. 191, t. 9. figg. 6 (animal), 7 (jaw), 8-11 (radula) . 
BIOL. CENTR.-AMER., Terr. and Fluviat. Mollusca, October 1898. 44 
