238 



LAND AND FRESH-WATER SHELLS OF N. A, [PART I, 



, Fig. 410. 



Pupa decora, 

 enlarged. 



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

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

 slightly reflexed, and indented opposite tha base of the two 

 labial denticles ; at the columella, it rises against a distinct 

 umbilical perforation. Length 21, diam. 1^ mill. 



Pupa decora, Gocld, Proc. Bost. Soc. Nat. Hist. II, 263 

 (Dec. 1847), with a woodcut ; in Terr. Moll. II, 327, 

 pi. Ixxi, f. 2. — Pfeiffer, Mon. Hel. Viv. Ill, 555. — 

 W. G. BixxEY, Terr. Moll. IV, 143. 



Near Lake Superior. 

 (^Kennicott.) 



Fort Resolution, Great Slave Lake 



Pupa corpulenta 

 Fig. 412 



corpulenta, Morse. — Shell rimate perforate, elongate 

 ovate, finely striated, polished, translucent, 

 dark olive brown ; apex round, obtuse ; whirls 

 four, convex, tumid, wider at the base ; aper- 

 ture large, subcircular, with four obtuse teeth, 

 one on the parietal margin, one on the colu- 

 mellar margin, and two on the labrum ; peri- 

 stome slightly thickened and reflected. Length 

 .10 inch, breadth .06 inch, (J/or.se.) 



Isthmia corpulenta, Morse, Ann. N. Y. Lye. 

 VIII, 210, f. 7 (Nov. 1865). 



Little Yalley, Washoe Co., Nevada; 

 on east slope of Sierra Nevada, 6500 feet 

 above the sea. 



Pupa rO"Wellii, Newcomb.— Shell per- 

 forate, oblong-ovate, dark horn-colored, shining, 

 translucent, finely striated ; apex obtuse ; whirls five, convex ; 

 aperture truncately ovate, armed with four teeth, one promi- 

 nent and plicate on the columella, three deeply seated within 

 the aperture, one on the columella, two within the peristome; 

 peristome slightly reflected. Length 2, breadth 1 mill. 



Pupa roiveUii, Newcomr, Ann. N. Y. Lye. VII, 146.— Bland, 

 Ann. N. Y. Lye. VIII, 166, f. 11 (1865). 



Near Oakland, California. 



