CHIEFLY OF THE UNITED STATES. 169 



Lady Catherine Douglas. It is more cylindrical than any species with which I am 

 acquainted. The brown band near the edge of the lip is of a light color, and more 

 strongly marked outside than in. In outline it is near to acuta, Drap., is a little 

 larger and more transparent. Of our indigenous species it is nearest to virginea, 

 Gould, but it is straighter, the spire is shorter, and the species is larger. It is very 

 thin, clear white, and shows the columella through the whorls. The aperture is 

 about seven-tenths the length of the shell. 



'o"- 



Phtsa crocata. pi. 24, fig. 90. 



Testa elliptica, subtenui, nitida, crocata; spira obtusa ; suturis impressis ; anfractibus quaternis, ultimo 

 grandi et subinflato; apertura elliptica; labro acuto, subter marginem crocato-vittata ; columella 

 medio incrassata, impressa et contorta. 



Shell elliptical, somewhat thin, shining, light yellow saffron ; spire obtuse ; sutures 

 impressed ; whorls four, the last one large and somewhat inflated ; aperture elliptical ; 

 outer lip acute, saffron-banded under the margin ; columella thickened, impressed 

 and twisted in the middle. 



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



Hab. — Lafayette, Walker County, Georgia, Rev. G. White. 



My cabinet and cabinet of Mr. White. 

 Diam. -30, ' Length -51 inch. 



Remarks. — I have about a dozen of this species, three or four only being mature. 

 It is of a light yellow saffron, with a saffron band somewhat removed from the edge. 

 It is allied to elliptica, (nobis,) but is of a different color and has a more inflated out- 

 line. In outline it is near to Troostiana, (nobis,) but may easily be distinguished by 

 its lighter color as well as by its being much thinner, — Troostiana being unusually 

 thick for a Physa, — with a dark line immediately on the edge of the outer lip, and a 

 thickened band within the edge. The aperture is about seven-tenths the length of 

 the shell. 



Phtsa Smithsoniana. PI. 24, fig. 91. 



Testa elliptica, subtenui, subdiaphana, nitida, pallido-fusca, fere olivacea ; spira subacuta; suturis im- 

 pressis; anfractibus quinis, convexiusculis, ultimo grandi et parum constrieta; apertura elcngato- 

 elliptica; labro parum incrassato, subter marginem tenebroso-fusca ; columella impressa et contorta. 



Shell elliptical, rather thin, translucent, shining, pale-brown, almost olivaceous ; 

 spire rather acute ; sutures impressed ; whorls five, somewhat convex, the last one 

 large and somewhat constricted ; aperture elongately elliptical ; outer lip somewhat 

 thickened and dark brown under the margin ; columella impressed and twisted. 

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



43 



