PULMONATA. 77 
in the smaller species, M. Deshayes attributes but trifling value to that character, and 
proposes to suppress the genus altogether. 
The living species are very numerous and widely disseminated, but the larger 
ones are confined apparently to tropical climates. 
The fossil species are few; one species (Pupa Defrancii) is described by Brogniart 
from the Freshwater deposits of the Paris basin. Bouillet, in his catalogue 
of the fossil shells of Auvergne, gives two others referred to recent species; and 
Matheron describes two more species from the South of France, one from the Fresh- 
water formation at Baux, and the other from the middle beds of the lignite formation 
near Rognac. 
No. 26. Pupa PERDENTATA. Ff. HL. Hdwards. Tab. XI, fig. 7 a—e. 
P. testa cylindrica ; apice .  . ? anfractibus planulatis, longitudinaliter costellatis, 
ad basin sub-angulatis ; costellis aculis, numerosis, irregularibus, undulosis, parum obliquis ; 
apertura sub-quadratd, multis lamellis inequalibus, penitissimé decurrentibus, utroque margine 
enstructa. 
The imperfect state of my specimens, which are merely casts, will not enable 
me to do much more than to record the existence of this well-marked species. The 
dentition they present rather belongs to Clausilia than to Pupa; but as this is a dextral 
shell, and all the known Clausilie are sinistral, I refer it to the present genus. I 
possess Six or seven specimens only, all without the apex, and the largest showing 
only the last three whorls. The characters, so far as they can be given from these 
fragments, are as follows :—Shell cylindrical, apparently elongated, and composed 
of many whorls; the whorls nearly straight, longitudinally costellated, and bluntly 
angulated at the base; the costellz sharp, oblique, numerous, irregular, undulating, 
and separated by deep rounded sulci, and here and there one of them terminates 
abruptly, bemg cut short by the confluence of the sulci. The aperture, owing to the 
angular base of the body-whorl, assumes a subquadrate, or rather a lozenge shape ; 
the outer lip presents no less than fourteen lamelliform teeth, six of which are large, 
having smaller teeth between them; the columellar lip is armed with three large 
Jamelliform teeth, and four smaller. These teeth are not merely marginal, as is usually 
the case in this genus, but are continued, like those of Clausilia, far back into the 
whorls. 
Size—Axis  .  .  ? diameter, 2-10ths of an inch nearly. 
Locality.—Sconce, where it is very rare. 
