312 NEW MELANIDiE OF THE UNITED STATES. 



Shell smooth, elliptical, thick, yellow, four-banded ; spire very obtuse ; sutures ir- 

 regularly impressed ; whorls four, somewhat convex above, the last one very large ; 

 aperture large, subrhomboidal, whitish and banded within ; outer lip acute, scarcely 

 sinuous ; columella thickened above and below. 

 Proc. Acad. Nat. Sci., 1862, p. # 266. 



Hah. — Tennessee River, W. Spillman, M. D. 



My cabinet and cabinet of Dr. Spillman. 

 Diam. -34, Length -64 inch. 



Remarlcs. — Among the Melanidce sent by Dr. Spillman with simply the habitat 

 Tennessee River, were four of this species. I presume they are from that part of the 

 River which is in or near to Alabama. All the three specimens are very similar in 

 color, size and bands. It is one of that group which approaches the genus Lithasia 

 by the thickening of the columella above and below, but it has no channel. It is 

 allied to Melania ( Goniobasis) elliptica (nobis) and Melania ( Goniobasis) auricularfor- 

 mis (nobis), but differs from the former in being smaller and having a less constricted 

 aperture ; from the latter in being larger and having a more obtruded spire and in 

 the bands. The aperture is about half the length of the shell. 



Goniobasis gibberosa. PI. 37, fig. 155. 



Testa, lcevi, subfusiforaii, crassS,, pallido-castanea vel rufo-castanea,, vittata vel evittata; spiraobtusa; 

 suturis irregulariter impressis ; aufractibus gibberosis, superne convexiusculis, ultimo pergrandi ; ap- 

 ertura pergrandi, rhomboidea, intus alba ; labro acuto, sinuoso ; columella incurva, superne et in- 

 ferne incrassatSL 



Shell smooth, subfusiform, thick; spire obtuse 5 sutures irregularly impressed ; 

 whorls hump-backed, slightly convex above, the last one very large ; aperture very 

 large, rhomboidal, white within ; outer lip acute, sinuous ; columella bent in, thick- 

 ened above and below. 



Operculum ovate, dark brown, with the polar point near to the base, on the inner 



edge. 



Proc. Acad. Nat. Sci., 1862, p. 266. 



Hab. — Alabama River, E. R. Showalter, M. D. 



My cabinet and cabinets of Dr. Showalter, and Dr. Hartman. 

 Diam. -48, Length 1-03 inch. 



Remarlcs. — Four specimens of this remarkable species are before me. They were 

 sent by Dr. Showalter to Dr. Hartman who called my attention to them and sent 

 them for examination. The species is singular for the four to six hump-like eleva- 

 tions which exist on the upper half of each of the whorls and which leave flattish sjjaces 

 between, on one of which spaces the shell will always rest when the specimen is moved 

 on a flat surface. One of the specimens has four distinct bands, one has these obsolete, 

 the two remaining ones are without bands. The only species to which this has close 



