CHIEFLY OF THE UNITED STATES. 173 



Hob. — Lafayette, Walker Co., Geo., Rev. Geo. White, and Verdigris River, Kansas, 

 F. Hawn, Civil Engineer. 



My cabinet and cabinets of Mr. White and Smithsonian Institution. 

 Diam. -22, Length "40 inch. 



Rema?-ks. — Some years since Mr. White sent to me a few of this small species with 

 many other river shells. It is near to inflata, (nobis,) from Central Virginia, but is a 

 smaller species, less inflated, rather more oblique and less transparent. The spire is 

 higher and more acute. It is also very near to virginea, Gould, but is rather larger 

 and not quite so elongate. The inner margin is thicker than usual. The aperture 

 is two-thirds the length of the shell. I name this species after the Rev. Geoi'ge 

 White, who has done much for the Natural History of Georgia. 



Physa Niagarensis. pi. 24, fig. 97. 



Testa suborbiculari, inflata, subdiaphana, nitida, suborassa, albida ; spira obtusa ; suturis impressis j 

 anfractibus quaternis, ultimo pergrandi ; apertura ovata, grandi ; labro expanse, subter marginem albo 

 et incrassato ; columella medio valde incrassata, impressa et plioa induta. 



Shell suborbicular, inflated, semi-transparent, shining, rather thick ; spire obtuse ; 

 sutures impressed ; whorls four, the last very large ; aperture ovate and large ; outer 

 lip expanded, white and thickened under the margin ; columella very much thickened 

 and impressed in the middle, and furnished with a fold. 

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



Hab. — Niagara River, New York. 



My cabinet. 

 Diam. '25, Length 'SS inch. 



Remarks. — This is a small species which I took many years since. I then thought 

 it might be a small variety of heterostropha, Say, but it is a more orbicular, thicker 

 species, and its color and surface differ. It is somewhat porcelainic. The mature 

 shell has two or three Mdiite bands near the edge of the aperture, and the columella 

 is broadly callous the whole length. In texture, size and color it is allied to Wkitei, 

 herein described, but that species is more elongate, has a higher spire, and a less 

 pronounced fold. The aperture is rather more than two-thirds the length of the 

 shell. 



Physa breVispira. PI. 24, fig. 98. 



Testa Isevi, lato-elliptlca, albida, diaphana, inflata ; spira brevissima, obtusa, vix exserta ; anfractibus 

 ternis, ultimo grandi et inflato ; labro acuto, margine intus incrassato; apertura pergrandi et dilatata; 

 columella incrassata, impressa et contorts. 



Shell smooth, broad elliptical, whitish, somewhat transparent, inflated ; spire very 



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