CARYCHIUM. 181 



Pfeiffer as early as 1841, and adhered to by subsequent 

 writers. 



I have added to the synonymy of this species Carychium 

 exile H. C. Lea, a shell I have never seen. Dr. Gould 

 has expressed the same opinion; (Bost. Proc. i. p. 61.) 

 Though there seems to me no room for doubt of the just- 

 ness of this decision, I add the description of Mr. Lea, as 

 well as a somewhat reduced copy of his figure (pi. 75, 

 fig. 23) of the aperture. 



I add also a copy of M. Bourgignat's description of C. 

 existelium and C. euphceum. Persons may thus judge for 

 themselves whether my decision is correct. I have not 

 seen authentic specimens. 



CARYCHIUM EXILE (pi. 1, fig. 5). C. testa ovato-conica, valde 

 elevata, subperforata, diaphana, albida, longitudinaliter striata ; 

 spira obtusa ; anfractibus senis, convexis ; suturis impressis ; aper- 

 tura elliptica, Integra, dentibus tribus ; labio valde reflexo. 



Shell ovately conical, much elevated, subperforate, diaphanous, 

 whitish, longitudinally striate ; spire obtuse ; whorls six, convex ; 

 sutures impressed ; mouth elliptical, entire, with three teeth ; lip 

 much reflexed. Length, .075 ; breadth, .025 of an inch. 



Hab. Under dead leaves and mould, on the Wissakiccon Creek, 

 near Philadelphia. Cabinet of I. Lea. 



Remarks. This beautiful little shell bears a strong resemblance 

 to the Pupa exigua of Say, and it is with some doubt that I pro- 

 pose it. The chief points in which it differs from that shell are the 

 following. The lip is continuous round the mouth, and not inter- 

 rupted by the last whorl, as is the case with the Pupa, thus being 

 a true Carychium ; the lip is flattened, the number of whorls is 

 greater, there is a tooth on the outer lip, the size is smaller, and 

 the shape more elongated. It also nearly approaches the Ca- 

 rychium minimum Leach, a European shell, but may be easily 

 distinguished by its striae, shape, number of whorls, perforation and 

 teeth. The tooth on the outer lip is very variable, being sometimes 

 almost obsolete, and sometimes larger than those on the inner one. 

 Of the two teeth on the inner lip, one is placed at the middle, and 



