PUPA. 



435 



Fig. 694. 



posite the largo tooth, almost as large and iuclhied to the left also, 

 is a quadi'augiilar Ijliiut tooth, nure slightly ciu'ved ; on the left 

 margin arc three teeth, of which the upper one is largest, and about 

 half the size of the basal tooth, of a blunt quadrangular figure ; the 

 other two are minute ; on the outer lip are also three 

 teeth, of which the two upper are very small and 

 pyramidal ; umbilicus open. Length, one fifteenth 

 of an inch ; breadth, one fourth of an inch. 



This minute species I first found under a loose 

 stone on the ledges at Phillips's Point, Lynn, near 

 the Ocean House. It was somewhat broken, so as to 

 give an excellent view of the teeth. Since then I have 

 met with it not unfrcqucntly in damp places, under 

 leaves and boards, in company with P. modesta. 



From Georgia and Mississippi to the British Pos- 

 sessions. 



The sliell goes on regularly narrowing both downwards and u}> 

 Avards from the middle of the lower whorl. Four of the teeth are 

 very small, and would scarcely ]je discerned without being highly 

 magnified, and they seem to be seated farther within the aperture ; 

 tlie small one on the transverse lip, the basal one, and the upper 

 one on the right lip are liable to be wanting. 



Teeth of i'. pentodon. 



Pupa decora. 



Shell cylindrical, thin, translucent, striated; whorls five or six, rounded; aper- 

 ture nearly round or semi-oval, with four denticles; peristome slightly reflexed ; 

 perforated. 



Pupa decora, Gon.D, Proc. Best. Soc. Xat. Hist. ii. 263 (Dec. 1P47), with a woodcut; in 

 Terr. Moil. ii. 327, pi. 71, fig. 2. — Pfeiffer, Mon. Ilei. Viv. iii. 555. — W. G. 

 BiNXEY, Terr. Moll. iv. 143. 



Pliell minute, cylindrical, rounded at apex, thin, shin- 

 ing, translucent, of a Avine-yellow color, regularly striated 

 by lines of growth ; spire of five or six closely revolving, 

 rounded whorls, deeply separated at the sutures ; aper- 

 ture nearly round or semi-oval, oldiquely limited by the 

 penultimate whorl, armed with four slender denticles, the 

 largest of them on tlie parietal wall, one on the columel- 

 lar portion of the peristome, and two on the outer portion, 

 all disposed so as to form the arms of a cross ; tlie peristome is 

 slightly reflexed, and indented opposite the base of the two labial 



