GONIOBASIS. 149 



Georgia, and a bleached one from the Tennessee Eiver. All these 

 specimens are without variation. There are usually five revolving 

 striae below and two above that round the peripher}', which make 

 compressed tubercles where they are crossed. These folds are bright 

 brown, nearly red on their left side, and give a maculate appearance 

 to the whole shell. These maculations are visible on the inside. The 

 compressed, sharp tubercles almost constitute spines, and, on first 

 looking at this shell, one is reminded of Melania spinulosa, Lam., but 

 it cannot be confounded with that species. In outline and in most of 

 its characters it is allied to JTallenbeckii, herein described, but it is 

 much smaller, and differs in being maculate instead of banded. The 

 aperture is about one-third the length of the shell. I dedicate this to 

 my friend, Mr. Canby, who kindly brought me some specimens. — Lea. 



I presume it was Mr. Lea's first intention to describe this 

 species under the name of Etowaheusls, as specimens are before 

 me, whicli that gentleman sent to Mr. Anthony under the 

 latter name. Mr. Reeve's description, which it is unnecessary 

 for us to reproduce here, is drawn up from Mr. Anthony's 

 specimen. The figure, which is copied from the original one, 

 gives but a faint idea of this beautifully variegated species, 

 which for gracefulness of contour stands unrivalled. 



It is doubtful whether this species is really distinct from 

 papulosa, Anth. In the j-oung shells, particularly, it is ex- 

 tremely diflScult to draw a line of distinction between the two. 



13. G. Hallenbeckii, Lea. 



Goniobasis Tlallenheclcii, Lea, Proc. Acad. Nat. Sci., p. 271, 1862. Jour. Acad. Nat. 



Sci., V, pt. 3, p. a-59, t. 38, f. 203, March, 18G3. Obs., ix, p. 161. 

 Melania Jlallenbeckil, Lea, Reeve, Monog. Melania, sp. 332. 



Description. — Shell tuberculate, transversely striate below, turreted, 



rather thin, pale horn-color or olivaceous, banded, or 



Fig. 281. 

 witliout bands ; spire elevatcly turreted ; sutures very 



much impressed ; whorls eight, cariuate, with compressed 

 tubercles at the periphery; aperture large, ovately rhom- 

 boidal, whitish within; outer lip crenulate, sinuous; col- 

 umella bent in, slightly thickened, and very much twisted. 



Habitat. — Randall's Creek, near Columbus, Georgia ; 

 G. Hallenbeck. 



Diameter, -47; length, 1-24: inches. 



Observations. — This is a very beautiful species, having some rcsem- 



