162 



* 



LAND AND FRESII-WATER SHELLS OF N. A. [PART IV. 



25. G. vesicula, Lea. 



Melnnia vesicula, Lea, Proc. Acad. Kat. Sci., p. US, ISGl. 



Goniobasis vesicula, LEA, Jour. Acad. Nat. Sci., v, pt. 3, p. 242, t. .35, f. 45, March, 

 18G3. Obs. ix, p. (U. 



Description. — Shell obscurely folded, elliptical, yellow, without spots, 



rather thiu; spire very short and obtuse; sutures rather impressed; 



F"" ."510 """lioi'ls three, somewhat convex; aperture large, regularly 



« ovate, pale salmon within ; outer lip sharp ; columella thick- 

 ened, incurved, rounded at the base. 

 //a&i«a«.— Alabama ; E. E. Showalter, M.D. 

 Diameter, -18; length, "37 inch. 



Observations. — A single specimen of this very small species was 

 found among others of a different species from Dr. Showalter. It is a 

 small, regularly oval, inflated species. In this .specimen there is a dis- 

 position on the upper part of the whorls to plication, and this pro- 

 duces obscure spots round this part of the whorls. Other specimens 

 may not have this character. The aperture is very large, being two- 

 thirds the length of the shell. It is nearly allied to Melania (Gonio- 

 basis) aiiricula;formis (nobis), but is not so large and has a wider 

 aperture, which is not so elongate. The color is nearly the same, but 

 the tint is rather brighter. It cannot be confounded with Melania 

 (Goniobasis') corneola, Anth., although of the same size and color, that 

 shell being fusiform, with a conical spire and an aperture only half 

 the length of the shell. — Lea. 



28, 



C. Shell plicate. 

 G. obesa, Anthony. 



Melania obesa, Anthony, Reeve, Monog. Melania, sp. 469, May, 18G1. Brot, List, 

 p. 33. 



Description. — Shell globosely ovate, solid, fulvous, 

 obscurely banded with olive-green; spire short, rather 

 immersed ; whorls five, slopingly rounded, longitu- 

 dinally, obsoletely, rudely plicated, last whorl spirally 

 ridged and striated round the lower part; aperture 

 ovate, a little effused at the base. 



Anthony, manuscript. 



Habitat. — Alabama, United States. — liecve 



Fig. 311. 



