Descn'plions of New Fluviatile Shells. 

 42. Melanin compacta. 



Plate III. Fig. 22. 



T. ovato-conica, glabra, crassa, straraineo-vi rente ; spira obtuse ele- 

 vata ; anfr. 5, superioribus subplanis, fasciis nigris duabus cinctis quarum 

 inferior sutura, fere occulta est, ultimo subangulato, trifasciato ; suturis 

 impressis ; apertura ovata, intus albida et fasciata, columella foveata, 

 incurva, ssepe purpureo-tincta, sinum baud formante. 



Shell ovate-conic, smooth, thick, yellowish-green ; spire ob- 

 tusely elevated ; whorls about 5, nearly flat ; body whorl 

 large, subangulated near the base, with three very dark bands, 

 two of which are below the angle ; the penultimate whorl has 

 two bands only, and the lowest of these is nearly or quite con- 

 cealed by the suture, and on the upper whorl the same band 

 is indicated only by a dark, hair-like line; sutures well im- 

 pressed ; aperture rather large, ovate, within whitish and 

 banded ; columella strongly indented, base regularly rounded, 

 without any sinus. 



Length 0.60 inch (15 millim.). Diam. 0.38 inch (10 millim.). 



Length of aperture 0.30 inch (7$ millim.). 



Breadth of . do. 0.18 inch (4$ millim.). 



Habitat. Alabama. 



My cab. Cab. Lye. Nat. Hist., 1ST. Y. B. W. Budd, M.D. 



Obs. A short, thick, compact species, with seldom more 

 than three perfect whorls remaining, other two whorls being 

 indicated on the abruptly decollate spire ; the whorls are 

 slightly shouldered, and the lines of growth are curved and 

 prominent ; compared with M. fusiformis Lea } it is less fusiform, 

 more ponderous, has the spire less acute, and an aperture en- 

 tirely different ; from M. proteus Con. it differs in its totally 

 different spire and aperture, and its want of the tuberculous 



