8 



"Length, .14 inch; breadth, .07 inch; diameter of the aper- 

 ture, .045 inch." (ADAMS, Bost. Journ. Nat. Hist. III. 331) 



This species was discovered at Crown Point, N. Y., by 

 Professor G. W. Benedict, of the University of Vermont. I 

 have also received it from the vicinity of Troy, N. Y. It is 

 the largest of the North American species, except P. armifera, 

 from which it is at once distinguished by its dark mahogany 

 color. 



It is almost precisely like P. marginata, DRAP., BRARD, &c. 

 the P. muscorum, LAM. It belongs to the genus PUPILLA, 

 Leach. See Turton's Manual, (Gray's edition,) 196, pi. VII. 

 fig. 79. See also, Adams, Catalogue of Mollusca, in Thomp- 

 son's History of Vermont. 



In the preceding part of this paper I remarked, that there 

 were two or three described species of the genus Pupa, which 

 I had not then seen, or had failed to identify them with their 

 descriptions. During the long interval which has since 

 elapsed, through the kindness of my friends I have succeeded 

 in obtaining all of them. These I shall now proceed to de- 

 scribe, and also to communicate such facts respecting the spe- 

 cies previously noticed, as a more extended observation has 

 disclosed. 



PUPA OVATA. 

 Plate XVI. figs. 7, 8. 



P. ovata, umbilicata, castanea ; anfractibus quinque, convexis ; apertura subcor- 

 data, dentibus 5 ad 9 lamellosis armata, quorum 1-3 postice, duo ad columellam, 

 2-5 ad labium inflexum adnatis. 



" Shell dextral, subovate, brown ; apex obtuse ; whorls five, 

 glabrous ; suture not very deeply impressed ; body whorl in- 

 dented near and upon the labrum ; aperture semioval ; labium 

 five toothed, of which three are situate on the transverse por- 

 tion of the lip, parallel to each other, equidistant, the superior 

 and inferior ones being small, the latter sometimes obsolete, 

 the intermediate one lamelliform, prominent, and the two 



