66 CONCHOLOGIA CESTRICA. 



\ 



L. caperata, SAY. 



caperata. Lymncus caperatus, Say, New Harm. 



Diss - "> i82 9- 



Shell, elongate-oval, yellowish horn color; 

 spire acute, equalling the length of the aper- 

 ture ; whorls with five equilateral revolving 

 lines ; suture impressed ; aperture rather di- 

 lated. H. 26, W. 10, mill. 



Station, Schuylkill River ; common. 



Genus PHYSA, DRAPARNAUD, 1801. 



Animal of P7iysa. [W. G. B.] 



Figf 128. 



Shell, sinistral, oblong, thin, polished ; spire acute ; 

 aperture oval, rounded below, not dilated; inner lip 

 formed by a deposit on the last whorl; outer one 

 acute. 



Animal, tentacles slender, setaceous; mantle digitate; 

 foot long, posteriorly, acuminate. 



P. ancillaria, SAY, Jour. Acad. Phila. F. S., V., 

 1825. 



F.ancMlaria. Shell> gub-globoSC, brOWllish - yellow J 



Fig. 129. whorls 4, rapidly attenuated ; spire hardly 

 elevated above the general curve ; aperture 

 dilated, but little shorter than the shell ; lip 

 thickened on its inner margin. H. 16, W. 

 12, mill. 



Station, Brandywine Creek, Chester 

 County. 



