Descriptions of New Fluviatile Shells. 



8-9 ; superioribus carina ucuta angulatis et fascia nigra cinctis, ultimo 

 liris 4 et fasciis duabus cincto ; suturis inconspicuis ; apertura elongato- 

 ovata, intus cornea, bifasciata ; labro valde sinuoso; columella recta, in 

 sinum profundum producta. 



Shell deeply sulcate and carinate, ovate ; of a beautiful light 

 apple-green color, ornamented with two dark-green bands, and 

 an elevated, prominent carina of a light color revolving be- 

 tween them ; spire not remarkably elevated, but acute, of a 

 rather convex outline; whorls 8-9, somewhat convex, and 

 with sutures not prominent, but channelled ; body whorl with 

 about four caringe, the lowest one being indistinct ; aperture 

 small, sub-rhomboidal, with two bands in the interior, distant 

 from each other and from the edge of the outer lip ; outer lip 

 much twisted, auger-like, causing the sinus, which is small, to 

 curve backwards. 



Length 0.60 inch (15 millim.). Diam. 0.28 inch (7 millim.). 



Length of aperture 0.25 inch (6 millim.). 



Breadth of do. 0.13 inch (3 millim.). 



Habitat. Tennessee. 

 My cabinet. 



Obs. A beautiful little shell, of a singularly bright, lively 

 appearance ; the colors are well contrasted, very distinct, and 

 the prominent carinae add to the general effect. On the upper 

 whorls, but one band is visible, the lower one being concealed, 

 or nearly so, by the revolutions of the spire. It cannot well 

 be compared with any other species. 



28. Melania cristata. 



Plate JII. Fig. 8. 



T. rhomboidea, carinata, subcrassa, cornea, obscure fasciata; spira 

 brevi ; anfr. 5, superioribus subplanis, ultimo superne humeroso et in 



