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172 NEW UNIONID^, MELANIDiE, ETC. 



Remarks. — Only two specimens of this graceful and symmetrical species were found 

 among the shells brought by Mr. Hawn. It is a pretty little species belonging to the 

 heterostropha group, and nearest to Shoioalterii herein described. It may be dis- 

 tinguished from it by its having one more whorl, the spire being more produced and 

 the body whorl being less inflated, as well as being thinner and lighter colored. The 

 apical point is dark brown and includes the embryonic shell which is here counted 

 as one of the whorls, a practice I always follow when this can be observed. The 

 aperture is nearly two-thirds the length of the shell. 



Physa Foesheyi. pi. 24, fig. 95. 



Testa subfusiformi, subcrassa, subopaca, luteo-eornea ; spira exserta, acuminata ; suturis valde impressis ; 

 anfractibus senis, ultimo subgrandi ; apertura parviuscula, ovata, subconstricta ; labro subter margi- 

 nem incrassato et fusco-vittato ; columella inorassata et medio impressa et contorta. 



Shell subfusiform, rather thick, rather opake, yellowish horn-color ; spire exserted, 

 pointed ; sutures very much impressed ; whorls six, the last one large ; aperture 

 rather small, ovate and somewhat constricted ; outer lip thickened and brown banded 

 within the margin ; columella thickened, impressed in the middle and twisted. 

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



Hah. — Near Rutersville, Texas. Prof. C. G. Forshey. 



My cabinet and cabinet of Prof. Forshey. 

 Diam. "21, Length -36 inch. 



Remarlcs. — I have before me about a dozen of this little species, two only of which 

 seem to be mature. These two have a remarkably thickened columella and outer lip. 

 The form is very symmetrical and seems to be allied to Whitei herein described, and 

 to virginea, Gould. It is thicker than either. The aperture is two-thirds the length 

 of the shell. Prof Forshey sent me these specimens some years since with some 

 UnionidcB from his vicinity, and I name it after him. 



Physa Whitei. PI. 24, fig. 96. 



Testa subinflata, tenui, subdiaphana, parum nitida, albida ; spira subacuta; suturis valde impressia ; 

 anfractibus quaternis, convexis, ultimo grandi et parum inflate ; apertura elliptica, subter marginem 

 incrassata et pallido-salmonia ; labro incrassato, subconstricto ; columella impreSiSa et contorta. 



Shell somewhat inflated, thin, somewhat transparent, somewhat shining, whitish ; 

 spire rather acute ; sutures very much impressed ; whorls four, convex, the last one 

 large and somewhat inflated ; aperture elliptical, thickened and pale salmon within 

 the edge; outer lip thickened and somewhat constricted; columella impressed and 

 twisted. 



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



