PUPA SIMPLEX. 

 Plate III. fig. 2t. 



P. testa minima, cylindracea, obtusa, Isevi ; anfractibus sex, subplanulatis ; aper- 

 tura orbiculari, edentula. 



Shell minute, the two anterior thirds cylindrical, surmount- 

 ed by a rapidly formed, blunt apex ; light chestnut-colored. 

 Whorls five, moderately convex, separated by a well-im- 

 pressed suture, quite smooth ; aperture circular, excepting 

 a slight encroachment by the preceding whorl ; lip simple, 

 sharp, slightly everted on the left side, and partially hiding 

 a small umbilicus. No trace of a tooth has been detected. 

 Length ^ of an inch ; breadth ^ of an inch. 



The only locality where this has been found is a small 

 grove, a little northward of Fresh Pond, in Cambridge. In 

 this place numerous specimens have been found by myself 

 and others, at every season from May to November. They 

 live among the decaying leaves, in company with HELIX 

 linedta, labyrinthica, chersina, and indentdta. Having been 

 gathered in spring and autumn, we may safely suppose some 

 of them to have been adult ; yet none of them exhibit any 

 trace of a tooth. Its circular aperture readily distinguishes it 

 from all our other species. It is nearly identical, however, 

 with P. edentula, DRAP. (Vertigo nitida, FERUS.) 



f PUPA BADIA. 



Plate III. fig. 18. 



" P. testa parva, rubro-fusca, cylindracea ; apice perobtusa , anfractibus septem, 

 convexis ; apertura orbiculari, unidenlata ; labro contracto, subrefiexo." 



" Shell small, reddish brown, cylindrical, very obtusely ta- 

 pering in the two upper whorls ; whorls seven, moderately 

 convex, with a well impressed suture ; aperture orbicular, its 

 plane nearly parallel with the axis of the shell, less than one 

 third of the length of the shell, with the margin slightly re- 

 flected, and the sub-margin contracted, with a single rather 

 small tooth on the penultimate whorl ; umbilicus moderate. 



