170 NEW UNIOA^IDiE, MELANIDiE, ETC., 



5a&.— Loup Fork of the Platte River, F. V. Hayden, M. D. 



My ^cabinet and cabinet of Smithsonian Institution. 

 Diam. -45, Length -47 inch. 



Bemarhs. — Among the Mollusca brought by Dr. Hayden from the Expedition to 

 the Upper Missouri and Yellow Stone, under Lieut. Warren, were three specimens of 

 this species, which is remarkable for its graceful symmetry and color which approaches 

 that of the Melmiice. The two mature individuals have, on the last third of the body 

 whorl, three longitudinal brown bands, bordered with pale yellow, and this may be a 

 permanent character. These bands are more marked outside than in. In outline it 

 closely resembles elliptica, (nobis,) but is not quite so oblique, is of a darker color and 

 differs in having several bands. The aperture is about seven-tenths the length of the 

 shell. 



I name this species in honor of the founder of the noble Smithsonian Institution, 

 over which Prof Joseph Henry has presided with so much usefulness to the Science 

 of the country. 



Phtsa Showalterii. PL 24, fig. 92. 



Testa subfusiformi, subinflata. subdiaphana, subtenui, pallido-cornea ; spira parum producta, acuminata ; 

 suturis valde impressis ; anfractibus quinis, convexis, ultimo grandi ; apertura magna, elliptica ; labro 

 regulariter expanse, subter marginem late incrassato et crocata ; columella medio valde impressa, in- 

 crassata, contorta et plica induta. 



Shell somewhat fusiform, rather inflated, semi-transparent, rather thin, pale horn- 

 color ; spire somewhat produced, pointed at the apex ; sutures very much impressed ; 

 whorls five, convex, the last one large ; aperture large, elliptical ; outer lip regularly 

 expanded, thickened and saffron color under the margin ; columella much impressed 

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

 Proc. Acad. Nat. Sci. 1864, p. 115. 



ffab. — Uniontown, Ala., E. R. Showalter, M. D. 



My cabinet and cabinet of Dr. Showalter. 

 Diam. -27, Length -48 inch. 



Remarks. — A few years since Dr. Showalter sent to me three specimens of Physce 

 which he had lately observed in a pool of water which had only recently been 

 formed. The largest one was a large sized gyrina, Say, but the other two were 

 smaller and evidently distinct. The whorls are more inflated with much deeper 

 sutures. It is more of the outline of Halei, herein described, but is a thicker, darker, 

 smaller shell with a more produced spire. The second specimen is more slender, with 

 less inflated whorls, and may indeed be of a different species. The aperture is two- 

 thirds the length of the shell. I have great pleasure to name it after Dr. Showalter, 

 who has labored so successfully to develope the Mollusca of Middle Alabama. 



