28 CLASS GASTEROPODA. 
little forked. The anus is altogether at the posterior extremity, 
between the point of the mantle and that of the foot ; and the 
same orifice conducts to the pulmonary cavity, situated along | 
the right side. The orifice of the male organ of generation is 
under the inferior right tentaculum, and that of the female 
organ under the middle of the right side. These organs, as 
well as those of digestion, are very similar to those of the 
snail. . | 
These mollusca belong to both Indies, and are very similar 
to our slugs. 
TESTACELLA, Lam., 
Have the orifice of respiration and the anus at the posterior 
extremity ; their mantle is very small, and situated on this 
same extremity. It contains a small oval shell, with very 
wide aperture, and a very small spire, not equalling the tenth 
part of the length of the body. For the rest, these animals re- 
semble slugs. 
A species is found tolerably abundant in our southern 
departments (Testacella haliotoidea, Draparn.), Cuv. Ann. 
Mus. V. xxvi. 6—11, which lives under ground, and feeds 
chiefly on earth-worms. M. de Férussac has observed that 
its mantle is extraordinarily developed when it finds itself 
in too dry a place, and thus affords it a kind of shelter. 
PARMACELLA, Cwv., 
Have a membranaceous mantle, with loose edges, placed on 
the middle of the back, and containing, in its posterior part, 
an oblong flat shell, which exhibits behind a slight com- 
mencement of spire. The orifice of respiration and the anus 
are under the right side of the middle of the mantle. 
The first known species is from Mesopotamia, Parmacella 
Olivieri, Cuv. Ann. Mus. V. xxix. 12—15. 
There is one belonging to Brazil (P. palliolum, Féruss. pl. 
vil. A.), and some others of the Indies. 
