6 AMERICAN JOURNAL 



Dimensions. — Length 19 mill., diam. 6*5 mill. 



Habitat. — Georgia. 



My Cabinet. 



Observations. — 'This species belongs to the great group of tu- 

 berculate Goniobases so characteristic of the rivers of Georgia, 

 among which may be named G. Etowahensis, inclinans, papillosa, 

 Postellii, &c. It differs from all of them by its crisp, rigid ap- 

 pearance. It resembles somewhat, in form, G. porrecta, Lea, 

 but is well distinguished by being a little wider, and by the 

 strife being undulated above. 



LYMN^EID^E. 



5. Physa coniformis, Tryon. — t. 2, f. 5. 



Description. — Shell obovate or somewhat cone-shaped, the 

 spire very short, with an acute, black-tipped apex ; body 

 whorl round, shouldered above, inflated, but becoming nar- 

 rower below, while the long, somewhat ear-shaped aperture is 

 broadly rounded below, causing the shell to resemble strikingly 

 in outline, Conns tulipa, Linn.; whorls 5, the first ones minute; 

 suture well impressed, lines of growth close and fine, surface 

 polished, texture moderately thin, translucent. Color greyish- 

 white, the lip slightly thickened and colored red ; columella 

 appressed, twisted and turned back at base, very much as in 

 Ph. venusta, Lea, or Ph. diaphana, nob. 



Dimensions. — Length 16 mill., diam. 9*5 mill., length of 

 aperture 12 mill. 



Habitat. — Humboldt River, Oregon, (W. M. Gabb.) 



My Cabinet. Cabinet of Wm, M. Gabb. 



Observations.— A very distinct species, of which I possess 

 several specimens. It is well separated from all the nume- 

 rous species inhabiting the Pacific States, by its peculiar form ; 

 the color, also, is rather unusual. 



6. Physa oleacea, Tryon. — t. 2, f. 6. 



Description. — Shell completely oval, with the outline of the 

 spire not elevated above a continuation of the general curve 

 of the body ; spire very short, apex minute, suture linear, but 

 margined ; whorls 4, rapidly increasing, the last large, nar- 

 rowly oval; aperture long and narrow, the lip much thickened 

 within; columellar lip heavy, polished, slightly twisted and 

 turned back; texture thin, diaphanous, surface almost un- 

 marked by growth -lines, brilliantly polished, and bright oil- 

 colored; columella tinged with pink, lip margined with dark 

 red. 



