CHIEFLY OF THE UNITED STATES. 161 



Lysine A Smithsoniana. PL 24, fig. 76. 



Testa fusiformi, subtenui, rufo-fuscescente, subdiaphana, parum perforata, excellissime transverse striata ; 

 spira obtusa; suturis impressis; anfraotibus senis, convexis; apertura grandiuscula, ovata, submar- 

 ginem fusca ; labro espanso ; columella parum incrassata et vix plicata. 



Shell fusiform, rather thin, reddish-brown, slightly transparent, slightly umbilicate, 

 very minutely and transversely striate ; spire obtuse ; sutures impressed ; whorls six, 

 convex ; aperture rather large, ovate, brown within the margin ; outer lip expanded ; 

 columella somewhat thickened and scarcely plicate. 

 Proc. Acad. Nat. Sci., 1864, p. 113. 



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



My cabinet and cabinet of Smithsonian Institution. 

 Diam. -35, Length -47 inch. 



Remarks. — Several specimens of various ages were sent to me by the Smithsonian 

 Institution, with other shells collected by Dr. Hayden when on the Exploring Expedi- 

 tion to the Upper Missouri and Yellow Stone Rivers, under Lieut. Warren, U. S. A. 

 It is a symmetrical species inflated like umbilicata, Adams, but is larger, more inflated 

 and has a broader dark band within the outer margin. It has nearly the same outline 

 as Haydenii, (nobis,) from the Yellow Stone River, but is a much smaller species and 

 with a much less plicate columella. It is also allied to Traskii, herein described, but 

 is not so elongate nor has it so broad a band within the margin. The aperture is 

 rather more than half the length of the shell. I dedicate this species to the founder 

 of the noble Smithsonian Institution, which has done so much for the advancement of 

 the Science of the country. 



Ltmn^a Jamesii. pi. 24, fig. 77. 



Testa subturrita, tenuissima, albida, diaphana, perforata, striis rectis indutis ; spira exserta ; suturis valde 

 impressis ; anfractibus quinis, convexis ; apertura grandiuscula, subrotuudata ; labro expanse ; 

 columella aliquanto plicata. 



Shell subturrited, very thin, whitish, transparent, umbilicate, furnished with per- 

 pendicular stride ; spire drawn out ; sutures very much impressed ; whorls five, con- 

 vex ; aperture rather large and somewhat rounded ; outer lip expanded ; columella 

 somewhat plicate. 



Proc. Acad. Nat. Sci., 1864, p. 113. 



Hab. — Ponds near Cincinnati, Ohio, U. P. James, Esq. ; and Lafayette, Walker 

 County, Georgia, Rev. G. White, 



My cabinet and cabinet of Mr. James. 

 Diam. -22, Length -45 inch. 



Remarks. — Mr. James some years since sent me about a dozen specimens. At 



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