CHIEFLY OF THE UNITED STATES. 175 



Phtsa Grosvenorii. pi. 24, fig. 100. 



Testa ovato-fusiformi, subrecta, subinflata, vel albida vel dilute straminea, polita ; spira aliquanto esserta ; 

 suturis impressis ; anfraetibus quinis, ultimo grandiusculo ; apertura ovata, subgrandi ; labro subex- 

 pansoj subter marginem incrassato ; columella incrassata, valde impressa, plicata et valde contorta. 



Shell ovately fusiform, nearly straight, somewhat inflated, white or pale straw- 

 yellow, polished ; spire somewhat exserted ; sutures impressed ; whorls five, the last 

 one rather large ; aperture oval, rather large ; outer lip somewhat expanded, 

 thickened under the margin ; columella thickened, very much impressed, folded and 

 very much twisted. 



Proc. Acad. Nat. Sci. 1864, p. 114. 



Eah. — Santa Rita Valley, Kansas ? Mr. H. C. Grosvenor. 



My cabinet and cabinet of Mr. Grosvenov. 

 Diam. -18. Length -30 inch. 



Remarks. — I have before me five specimens received from Mr. Grosvenor, after 

 whom I have great pleasure in naming it. Two of the specimens only are matured, 

 and these are only one-fourth of an inch in length. They are transparent, showing the 

 axis through the sides. Both specimens have a broad white band under the margin 

 of the outer lip. It is a symmetrical, graceful little species, and is allied in outline 

 to Showalterii, Niagarensis and BlancUi, herein described, but is smaller and less 

 inflated than either of them. It has the same number of whorls with Showalterii, 

 but has one more than Niagarensis and Blandii. The aperture is about two-thirds 

 the length of the shell. 



Physa Nicklinii. pi. 24, fig. 101. 



Testa elliptica, subcompressa, diaphana, polita, tenuissima, margaritaeea ; spira obtusa ; anfraetibus qua- 

 ternis, subconstrictis, convexiusculis, ultimo magno ; apertura elongato-ovata ; labro arquato ; colum- 

 ella medio parum impressa, contorta et parva plica induta. 



Shell elliptical, somewhat compressed, transparent, polished, very thin, pearly 

 white; spire obtuse; whorls four, somewhat constricted, very slightly convex, the 

 last one large ; aperture elongately oval ; outer lip bowed ; columella slightly im- 

 pressed in the middle, twisted and furnished with a fold. 

 Proc. Acad. Nat. Sci., 1864, p. 114. 



Eah. — Callaghan's, Alleghany County, Va., P. H. Nicklin, Esq. 



My cabinet. 

 Diam. '20, Length -37 inch. 



Remarlcs. — Many years since two specimens, evidently not mature, were given to 

 me by my late friend Mr. Nicklin, with other fresh water shells. It is a symmetrical, 

 nearly straight species, so transparent that the columnar structure may be observed 



