116 Descriptions of New Fluviatile Shells. • 



Shell elongate-ovate, smooth, moderately thick ; of a pale 

 horn-color, with a faint, brown, narrow band on the penult 

 whorl, increased to two on the body whorl, and obsolete on the 

 apicial ones ; spire obtusely elevated, with a rather convex out- 

 line and a well defined suture ; whorls, four remaining, with 

 indications of two more lost by truncation, body whorl angu- 

 late, and rather coarsely striate longitudinally ; aperture rather 

 large, ovate, pale within, ornamented with the two bands of 

 the body whorl, which do not reach the outer edge, a broad, 

 plain area intervening; columella curved, with a very slight 

 sinus at base. 



Length 0.50 inch (12 millim.). Diam. 0.25 inch (6 millim.). 



Length of aperture 0.27 inch (7 millim.). 



Breadth of do. 0.15 inch (4 millim.). 



Habitat. — Tennessee. 

 My cabinet. 



Obs. — This is a very neat, pretty species, whose affinity with 

 any other is not so strong as to endanger its being easily con ■ 

 founded ; from 31. angulata nobis* it differs in being broader, 

 less angulated, paler in color, less elongated, and by its brown 

 bands, that species being entirely plain. 



[ 36. Melania rhombica. 



Tlate III. Fig. 16. '. 



Testa ovato-conica, fusco-virente ; spira parum elevata ; anfr. 6, su- 

 perioribus planis, striis 3-4 cinctis, ultimo multistriato, in medio angu- 

 lato, infra angulum striis obsoletioribus ; suturis inconspicuis ; apertura 

 ovata, intiis albida ; columella incurva, sinum vix formante. 



Shell conic, rather thin, brown ; spire regularly pyramidal, 

 not elevated ; whorls about 6, flat, regularly and very dis- 



