NEW MELANIDiE OF THE UNITED STATES. 345 



granulations. Those striae are raised and rounded, and are darker than the ground. 

 The old specimen is of a rusty color, having heen covered with oxide of iron. The 

 aperture is more than half the length of the shell. There is some resemblance of 

 this shell to Melania (Goniobasis) Hydei, Con., but that is conical, having a high 

 granular spire. 



I name this after my friend Thomas Stewardson, M. D., to whom T am indebted for 

 many fine specimens of our .Southern mollusca. 



Goniobasis cadus. PI. 38, fig. 211. 



Testa cancellata, fusiformi, subcrassa, inflata, flaveseente, evittata; spira perobtusa ; suturis irregulariter 

 impressis; anfractibus quinis, convexiusculis ; superne cancellatis ; apertura pergrandi, ovato-rhom- 

 boidea, inttis albtt ; labro acuto, parum sinuoso ; columella incurva, incrassata et contorts,. 



Shell cancellate, subfusiform, somewhat thick, inflated, yellowish, without bands ; 

 spire very obtuse ; sutures irregularly impressed ; whorls five, slightly convex, 

 cancellate above; aperture very large, ovately rhomboidal, white within; outer lip 

 sharp, slightly sinuous ; columella bent in, thickened and twisted. 

 Proe. Acad. Nat, Sci., 1862, p. 272. 



Hah. — Georgia, Major J. Le Conte. 



My cabinet. 

 Diam. -33, Length -63 inch. 



Remarks. — A single specimen has been in my possession for many years. The 

 description was delayed in the hope of other specimens being found. It was a single 

 one among many species, brought by our late lamented Vice-President from Georgia, 

 which he placed in my hands. This species reminds one of Melania ( Goniobasis) 

 Deshaysiana (nobis), but it is entirely different in the outline and number of its 

 whorls, being a very short shell with a very different size of aperture. The 

 aperture is more than half the length of the shell. 



Genus TO. 



When I proposed, in 1831, to form the new genus Io for Mr. Say's Fusus fluviatilis, 

 there were no other allied species known to naturalists. I then proposed also to change 

 the specific name to fusiformis, as being more appropriate, and I gave a figure under 

 this name. At that time the canons of nomenclature were not so well understood nor 

 so strict as they have since been; and it is only justice to Mr. Say to relinquish my 

 specific name and replace his. Subsequently, in 1834, 1 proposed a new species under 

 the name of Io spinosa, (Trans. Am. Phil. Soc. vol. v. pi. 19, fig. 79, Obs. vol. i. p. 224). 

 More recently, Mr. Anthony, in the Proceedings of the Academy, (ISfiO,) proposed four 

 new species ; three of which I think belong to the two previously established species. 



88 



