46 GASTEROPODA. LIMACID. 
cave palate, armed with a single tooth or process, and a carti- 
laginous elastic tongue, transversely grooved and serrated. 
The cesophagus is moderately long ; the stomach membrana- 
ceous, bipartite, longitudinally elevated ; the intestine with two 
curvatures. Salivary glands of a moderate size, situated one 
on each side of the cesophagus, and terminating im a duct on 
each side of its orifice. Liver five-lobed, embracing the wind- 
ings of the intestine. Each lobe having its own gall-bladder, 
the three anterior of which send their ducts to the anterior ex- 
tremity of the duodenum by a common tube, formed by their 
coalescence, the two posterior ones, by a similar tube, to the 
same part. 
The central mass of the nervous system, which is somewhat 
bilobate, receives several nerves from the mouth and its vicinity ; 
one from each upper tentaculum ; one from each eye. The 
organs of generation, on the right side, form a plexus ; and 
send their nerves, by a common trunk, to the central mass. 
The two cesophageal nerves unite and form a (sympathetic) 
ganglion, which receives two nerves from the course of the ceso- 
phagus. The nerves of the foot jom the lower part of the 
inferior ganglion. 
Genus 20. ARION. 
Arion, Férussac. 
Limax, Auctorum. 
Apertura lateralis ante disci thoracici medium. Apertura 
branchialis dextra, anterior. Dorsum non carinatum, Glan- 
duld muciferd terminali instructum. Testa nullaintegra.  Cor- 
pus elongato-subovale, semicylindricum, anticé et posticé obtu- 
sum. ZJhorax anticé preesertim rugulosus. Dorsum et Latera 
tuberculis oblongis et subverrucosis, sulcisque confluentibus 
sculpta. Pes a corpore sulco divisus, lateribus latis. 
Lateral aperture placed before the middle of the thoracic 
disc. Branchial aperture on the right side anteriorly. Back 
not carinated ; its extremity furnished with a mucous gland. 
Shell rudimentary, composed of loose fragments. Body elon- 
gate, inclining to oval, semicylindric, anteriorly and posteriorly 
obtuse. Thoracic disc roughish, especially anteriorly. Back 
