24. CONCHOEOGTA> CEST RIGA 
orifice on the posterior, lateral, edge; foot narrow; 
length 4 to 5 inches. 
Oss. — An introduced species, from France; found in 
cellars, in Philadelphia. (Tryon.) And while this work 
is being printed, it has turned up in a cellar in West 
Chester, Chester County. Probably a direct importation 
from France, in connection with her wines. The figure, 
and description, has been reproduced from the admira- 
ble edition of Gould’s Invertebrata of Massachusetts, by 
W. G. Binney, Esq. 
Family HELICIDZ. 
The Snails. 
Animal of Mesodon palliata, —[B. & B.] 
Fig, 13, 

Animal, very similar to the Limacide; except the 
posterior part of the body, which is spiral, and raised 
off the foot, to be inserted in the shell; the pulmonary 
orifice is in the collar, or margin, of the mantle, near 
the angle of the mouth of the shell; the anal opening 
is contiguous thereto. S/e// discoidal, sub-orbicular, 
turbinate, or trochiform. 
Ops. — The true snails are oviparous, and hermaphro- 
dite; but require the union of two individuals, for 
reciprocal fecundation. They are both herbivorous and 
carnivorous. The eggs are usually deposited in places 
which they inhabit, to the number of fifty, or more. 
According to Dr. Binney, the depth is regulated by the 
distance the animal can penetrate the earth, while its 
shell remains above ground. They are globular, or 
roundly oval, sometimes slightly connected in bundles, 
