328 HELICID^. 



Geographical Distributiok". Inhabits the region 

 of Lake Superior, where it was first obtained by Mr. T. 

 R. Button, and subsequently by Mr. J. W. Foster. 



Remarks. This is one of our prettiest species. It is 

 rather larger and darker colored than P. corticaria ; 

 and its aperture is much smaller, and differently armed. 

 Its form, color, and armature are more like P. G-oiiMii ; 

 but its size is twice as great. It no doubt belongs to 

 the same section of the genus. — [g.] 



7. PUPA PENTODON, Say. 

 Plate LXII. Figuee 1. 



P. testa ovata, albida, umbilicat.n ; anfractibiis quinque, 

 convexis; apice sub-acuta ; apertura oblique semicircular!, 

 dentibus quinque ad octo munita, quorum uno vel duobus 

 postice, duobus ad columellam, duobus, usque ad quinque, 

 ad labrum positis ; labro expanse. 



SYNONVMS AND EEFEKESCES. 



Vertigo pentudun, Say, Journ. Acad. Nat. Se. II. 376. • 



Piijia pentodon, Gould, Boston Journ. Nat. Hist. IV. 353, pi. 16, f. 10, 11 ; 

 Monog. of genus Pupa, p. 11, pi. 16, f. 10, 11. 

 De Kay, Nat. Hist. N. York, (Moll.) 00, pi. 4, f. 48, pi. 35, 



f. 337. 

 Pfeiffee, Monog. Helic. Vis-. II. 339. 

 Pupa curvidens, Gould, Invertebrata, 189, fig, 120. 



Pitjta Tappania7ia, AoA^iis, Sillini. Journ. XL. Suppl. Thompson's Vermont. 

 Pfeiffee, Syrabolte, II. 05. 



DESCRIPTION. 



Animal blackish above, light gray below ; foot mode- 



