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. F. E. Edwards. Tab. XI, fig. 7 a — e. 



P. testa cylindricd ; apice . . ? anfractibus planulatis, longitudinaliter costettatis, 

 ad basin sub-angulatis ; costellis acutis, numerosis, irregularibus, undulosis, parum obliquis; 

 aperturd sub-quadratd, multis lamellis inequalibus, penitissime decurrentibus, utroque margine 

 instructd. 



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 adextral 

 shell, and all the known Clausilia 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 costellae sharp, oblique, numerous, irregular, undulating, 

 and separated by deep rounded sulci, and here and there one of them terminates 

 abruptly, being 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 

 lamelliform 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, 2-1 Oths of an inch nearly. 



Locality — Sconce, where it is very rare. 



