ORDER PULMONARIA. 35 
They inhabit stagnant waters in great numbers; they also 
abound with the planorbes, in certain layers of marl and calca- 
reous strata, which they evidently prove were deposited in 
fresh water. (Hel. stagnalis, Lin., of which H. fragilis is a 
variety ; H. palustris, H. limosa, &c.) 
Puysa, Drap. 
The physe, which were gratuitously placed among the 
bulla, have a shell very similar to that of a limneus, but 
devoid of the fold in the columella, as of the reflected edge, 
and very thin. When the animal swims or crawls, it covers 
its shell with the two notched lobes of its mantle, and has two 
long, slender, and pointed tentacula, on the greatly enlarged 
internal base of which are the eyes. They inhabit springs, &c. 
One of them, Bulla fontinalis, L., which is convoluted 
towards the left, is found in France. 
The neighbouring species, Bull. hypnorum, L.; and Physa 
acuta; and Scaturiginum, Drap.; require a fresh examina- 
tion of their animals. 
According to the observations of Van Hasselt, we should 
place here the 
ScARABZUS, Montf., 
Which has an oval shell, the aperture narrowed by projecting 
and stout denticulations, both on the side next the columella 
and that towards the external margin. This margin is en- 
larged, and as the animal renews it after each semi-whorl, the 
shell projects most on two opposite lines, and has a compressed 
appearance. 
They feed on aquatic plants in the Indian Archipelago. 
(Helix Scarabeus, Lin.) 
The two following genera were among the volute. 
AURICULA, Lam., 
Differing from all the preceding aquatic pulmonaria in the 
D2 
