ORDER PULMONARIA. 3 
to as a proof that the muscles of the animal can be detached 
from the shell; for, at a particular epoch, of all the whorls of 
the spire originally possessed by this bulimus, not a single one 
remains. Add Helix ovalis, Gm.; H. oblonga, Chemn., &c. 
Pupa, Lam. 
Summit of the shell very obtuse ; the last whorl in the adult 
narrower than the others, giving it the form of an ellipsoid, 
and sometimes almost that of a cylinder. The surrounding 
margin of the aperture is tumid, and encroached on at the side 
next to the spire by the preceding whorl. ‘The species are 
small, inhabiting humid places, among mosses, &c. 
Sometimes there is no denticulation. (Bulimus labrosus, 
Oliv., &c.) 
More commonly there is one in that portion of the aperture 
which is closed by the penultimate whorl. (Turbo uva, L.) 
It is frequently observed, also, inside the external edge. 
(Hel. vertigo, Gm., &c.) 
CHONDRUSs, Cuv. 
The aperture, as in the last-mentioned pupz, indented on 
the side next to the spire, by the preceding whorl, and 
bordered with salient lamine or teeth. But the form is more 
ovoid, like that of a common bulimus. 
Some of them have teeth on the margin of the aperture. 
(Bulimus zebra, Oliv., &c.) 
Others are furnished with more deeply-seated laminz. (Bu- 
limus avenaceus, Brug., &c.) 
Here terminates that series of terrestrial helices, the adult 
shells of which have a tumid margin round the aperture. 
SUCCINEA, Drap. 
Shell oval; the aperture higher than it is broad, as in 
bulimus, but larger in proportion ; margin of the aperture not 
