NEW MELANID/E OF THE UNITED STATES 233 



Bob. — Coosa River, Alabama, E. R. Showalter, M. D. 



My cabinet and cabinet of Dr. Showalter. 

 Diam. -38, Length -94 inch. 



Remarks. — All the five specimens before me are decollate, and have nearly the 

 general outline of Bulimus decollatus, Lam. Some have but two complete whorls, 

 while one has four ; probably when complete the number would be seven. Two of 

 the specimens have slight striae below, and one has a few obscure capillary bands. 

 The reddish brown shining epidermis well characterizes the species. The aperture 

 is small, and is probably a little more than the third of the length of the shell. 



Goniobasis Midas. PI. 34, fig. 28. 



Testa Iaevi, cyliudraceo-elliptica, crassiuscula, virente, obsolete vittata; spira valde obtusa; suturis irregu- 

 lariter iinpressis; anfractibus conipressiusculis, ultimo pergrandi, inferne obsolete striata; apertura 

 grandi, auriculasformi, intus Cferuleo-alba ; labro acuto, columella cceruleo-alba, incrassata, mflecta, 

 ad basim obtuse-angulatsL 



Shell smooth, cylindraceo-elliptical, somewhat thick, greenish, obscurely banded ; 

 spire very obtuse ; sutures irregularly impressed ; whorls somewhat compressed, the 

 last very large, obscurely striate below; aperture large, ear-shaped, bluish white 

 within; outer lip acute; columella bluish white, thickened and inflected, obtusely 

 angular at the base. 



Operculum subelliptical, spiral, dark brown, with polar point near the inner edge 

 and one-fifth from the base. 



Melania Midas, Proc. Acad. Nat. Sci. 1861, p. 119. 



Hab.— Coosa and Alabama Rivers, near Wetumpka, E. R. Showalter, M. D. 



My cabinet and cabinet of Dr. Showalter. 

 Diam. -48, Length -98 inch. 



Remarlcs. — This is a well marked species. There are several specimens before 

 me, differing but little. Two of them have a brown band in the interior of the upper 

 part of the aperture, another has none, but exhibits an obscure row of spots on the 

 upper whorls, which others have also. Two of the specimens have irregular, 

 tuberculous swellings on the upper part of the whorls, which obscure the bands, and 

 thus cause them to take on a maculate character. The increment of growth usually 

 commences below the previous termination, leaving angles on the sutures. In this 

 character one is reminded of Melania {Goniobasis) oppugnata (nobis). In these speci- 

 mens there is a difference in the form of the base of the aperture, one of them being 

 more rounded ; but this may arise from difference of age. In outline this species is 

 allied to Hartmanii (nobis), but it cannot be confounded with that shell, which is 

 much larger, more robust, more elevated in the apex, and has more and better 

 developed bands. It is on the other side near to Melania (Goniobasis) basalis (nobis). 

 The aperture is about two-thirds the length of the shell. 



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