172 



A MANUAL OF AMEKICAX LxiNU SHELLS. 



Poly&yrella polygyrella, Bland, 

 Shell widely umbilicate, discoidal, flat, sbiuing, translucent, yellow- 

 ish horn-colored, ribbed above, the ribs obsolete near the aperture, base 

 Fig. 162. rather smooth; spire scarcely elevated; whorls 7 to 8, some- 

 what convex, gradually increasing, the last slightly deflexed 

 above, armed within with two rows of three teeth, seen 

 through the outer wall; nmbilicus pervious, of equal size to 

 the apex; aperture snbvertical, oblique, lunate-oval; pcri- 

 p. poiygyreiia. gtomc dcprcsscd above, Avhite, siiiii)le, much thickened with- 

 in, the margins joined by a white, pliciform, elevated, triangular tooth. 

 Greater diameter 114, lesser 10^""" ; height, 5'"'". 



Eelix pohigip-eUa, Bland and Cooper, Ann. N. Y. Lye, vii, 365, pL iv, figs. 13-15 



(is(;i)._W. G. BiNNEY, L. & Fr.-W. Sli., i, 112 (1869). 

 rohjijyra pohi<jiirdla, Tkyon, Am. Journ. Conch., iii, 160 (1867). 

 PohjgyrcUa pohjgyri'Ua, W. G. Binney, Terr. MolL, v, 289. 



Central Province. Common on the Coeur d'Alene Mountains, espe- 

 cially on their eastern slope, in spruce forests ; Salmon River, Idaho. 

 Jaw and lingual membrane : see p. 171. 

 orenitalia unknown. 



Fig. 163. 



Family PUPID^. 



PUPA. (See below.) 

 Pupa corpiileiita, Morse. 

 Shell rimateperforate, elongate-ovate, finely striated, polished trans- 

 lucent, dark olive-brown; apex round, obtuse; whorls 4, convex, tumid, 

 wider at the base ; aperture large, subcircular, 

 with 4 obtuse teeth, 1 on the parietal margin, 1 on 

 the columellar margin, and 2 on the labrum ; peri- 

 stome slightly thickened and reflected. Length, 

 .10 inch; breadth, M inch. (Morse.) 



7 



Isthmia corpuhnta, Morse, Ann. N. Y. Lye., viii, 210, fig 



(Nov., 18U5). 

 Piq)a corpuhnta, W. G. Binney, L. & Fr.-W. Sh., i, 238 



(1869); Terr. Moll., v, 201. 

 Pupilla corpulenta, Tryon, Am. Journ. Concb., iii, 309 (1868), 



Little Valley, Washoe County, Nevada; on east 

 slope of Sierra Nevada, G,500 feet above the sea ; 

 Pupa corpulenta, enlarged. Colorado. Thus far Hot noticcd outside the Central 

 Province. 

 Animal unobserved. 



