80 EOCENE MOLLUSCA. 
aperture. On the columellar lip are three similar teeth, one, very large, close to the 
columella. 
I have not been so fortunate as to meet with any specimen having more than 
fragments of the shell preserved; the description therefore is principally taken from 
casts. The chief characters presented by them, namely, the large pliciform teeth 
and the produced aperture, are, however, plainly shown. The specimen represented 
by figs. 6@ and 6 4 is, I apprehend, the young shell. 
Size-—My most perfect specimen of the mature shell bas apparently lost the upper 
six or seven whorls; in its present state it presents six whorls only. The length of 
the axis is 6-10ths of an inch, nearly; the diameter 2-10ths, nearly. In a perfect 
state it was probably nearly an inch long. 
Locality— Sconce, where it is very rare. 
Genus 11th. SuccinEA.* Draparnaud. 1801. 
AmpuiBuLiMa, Lamarck, 1805; Hartm., 1821. 
AmPHIBULIMUS, Montf., 1810. 
CocutLouypRA, Férus., 1819. 
Gen. Char.—Shell ovate, or ovately conical, rather elongate; volutions few; spire 
short, pointed ; aperture large, entire, longitudinally ovate, oblique ; peristome sharp, 
not thickened nor reflected, and confluent with the columella; inner lip spread over a 
part of the body whorl; columella smooth, sharp-edged, with an imperforated axis. 
This genus, first created by Draparnaud, has been received without question by all 
Malacologists except Férussac, with whom it forms the sub-genus Cochlohydra in his 
extensive genus Heliz. The animals, like all others of this family, present a strong 
general resemblance to the typical Helix ; but, according to M. Deshayes, they offer 
modifications of the generative organs, which differ alike from those of Heliz and of 
Bulimus. WUamarck, in ignorance of Draparnaud’s genus, proposed his genus 4m- 
phibulima, which he afterwards suppressed, adopting the name given by Draparnaud. 
The shells are distinguished from @ulimus by the thin outer lip, and the rapidly 
enlarging whorls; and from Limn@a, to which they more nearly approach in general 
form, by the columella, which is thin, smooth, and sharp, and destitute of the oblique 
fold which characterises the columella of the latter genus. 
The Succinee are strictly land animals; for, although frequently covered by water 
and capable of long submersion, they live habitually on land in damp marshy places, 
near the margins of pools or ditches. 
The living species are not numerous, and are found chiefly in temperate climates. 
* Etym., Succineus, of amber, 7. e., amber-coloured. 
