PHYSA. 



9^ 



Physa poillllia, Conrad. — Shell with four volutions, horn-colored 

 and polished ; spire short conical ; body whirl ventricose ; aperture patu- 

 lous. Remark. It resembles Fh. heleroslropha, Say, but is much smaller 

 and thinner. * 



Randon's Creek, near Claiborne, Alabama, adhering to limestone rocks. 

 ( Co /I rod.') 



Phi/su pomilia, Conkad, Am. Journ. Sc. [i], XXV, p. 343 (1834). — DeKay, 

 N. Y. Moll. 81 (1843).— MuLLEK, Syn. Test. 1834 Prom. p. 35 (1836). 



I have not seen this species, aud have not been able to gather 

 any further information regarding it. 



Pliysa virgata, Gould. — Shell moderate, solid, smooth, elongate- 

 ovate, ash-colored with longitudinal olivaceous stripes ; spire elevated, 

 acute ; whirls four to five, well separated ; aperture Inflate, two-thirds the 

 shell's length ; columella moderately folded, but with a heavy 

 callus, within yellowish-red. Length f , breadth J inch. 



Found by Dr. T. H. Webb, in the river Gila, and near San 

 Diego. 



Quite remarkable, as being the only species yet known which 

 has variegated coloration. The stripes are found on some part 

 of every shell, and many are prettily ornamented throughout. 

 In size and proportions it may be compared with Ph. inicros- 

 toma, Hald. (^Gould,') 



Phjsa virrjata, Gould, Proc. Bost. Soc. Nat. Hist. V, 128 (1855) ; Otia, 218. 



Also found at Los Angelos. An authentic specimen is figured 

 above. 



158. 



Pl»ysa troostiaiia, Lea. — Shell elliptical, rather thick, yellow- 

 brown, smooth ; spire obtuse ; sutures slightly impressed ; whirls five, 

 slightly convex ; lip margined, thickened within ; aperture 

 small ovate, contracted. 



Hab. Near Nashville, Tennessee : Dr. Troost. My cabinet, 

 aud cabinet of Dr. Troost. Diam. .25, length .45 of an inch. 



This is a short obtuse species, about the size of P. aurea, 

 Nob. The substance of the shell is very thick for the genus, 

 and it is much more thickened within the margin than any 

 si^ecies I have observed. The line along the margin of the lip 

 is of a reddish-brown. The indentation of the columella is lower than 

 usual. The aperture is about two-thirds the length of the shell. (Lea.) 



Fig. 159. 



Physa 

 troostiana. 



