OP CONCHOLOGY. 227 



Observations. — This species, widely diffused throughout the 

 Pacific States, appears to take the place of our Ph. heterostro- 

 joha, with which it has been generally confounded. It may be 

 readily distinguished from that shell, however, by the very 

 different form of the columella, so profoundly indented above, 

 and so sharp, twisted, and curving forwards towards the base. 

 Viewed from the right side, the form of shell and columella 

 forcibly remind us of Limnaea emarginata, Say. 



9. Physa Peimeana, Tryon. — t. 23, f. 12. 



Description. — Shell oval; spire but little elevated above the 

 curve of the outline of the body whorl ; apex rather acute ; 

 suture moderate ; a little attenuated towards the base; aperture 

 narrow, ear-shaped, broader and well rounded below; colu- 

 mellar lip turned a little to the right, but well rounded, A 

 broad, but thin deposit of callus on the body whorl, connects 

 the ends of the lip margin. Surface smooth, polished, amber- 

 colored ; lip margined, and together with the columella tinged 

 with red. 



Dimensions. — Length 9 millimetres, diameter 6 mill. 

 Habitat. — Long Island. Temple Prime. 



My Cabinet. Cabinet of Mr. Prime. 



Observations. — A beautiful little species, of which I received 

 a number of specimens from various contiguous localities in 

 Long Island. It is a more inflated species than heterostropha, 

 and not shouldered like ancillaria, and is smaller than either 

 of them. In size and outline it is very near to Niagarensis, 

 but differs in color, texture, and in the direction of the colu- 

 mella. 



10. Physa lata, Tryon.— t. 23, f. 7. 



Description. — Shell very fragile, light horn-color, waxy, 

 irregularly striate; spire moderately elevated; whorls convex; 

 apex acute ; suture well impressed ; body inflated ; aperture 

 rather large, columellar lip turned to the right, very narrow, 

 distinctly folded. 



Dimensions. — Length lOJ millimetres, diameter 7 mill. 



Habitat. — Juniata River, at HoUidaysburg, Penna. Wm. 

 M. Gabb. 



My Cabinet. 



Observations. — This species has very much the form of Ph. 

 heterostropha, but is rather more ventricose, much thinner, and 

 the surface exhibits a peculiar glimmering lustre. It is more 

 like Ph. osculans, Hald., in its texture, color and lustre, but 

 t he latter is a much larger species. 



