GONIOBASIS. 209 



■R-horls much inflated, aud the last ■\vhorl very small. Some of the 

 specimens before me are but obscurel}^ folded. — iea. ^j ^^g riff 413 



Figured from Mr. Lea's plate. This is a very- 

 distinct species, on account of the great convex- 

 ity of the whorls. 



The following description and figure represents 

 half grown specimens : — 



Melania terebralis. — Shell folded, acutely turreted, rather thin, 

 shining, reddish-brown; spire much elevated; sutures much im- 

 Fis 414 P''^s^6<^l > whorls nine, convex, carinate above ; aperture small, 

 elliptical, whitish. 

 Habitat. — Tennessee. 

 Diameter, -24 ; length, '67 of au inch. 



Observations. — This species differs in the form of the folds 

 from any which have come under my notice. These folds are 

 from each other, but slightly raised, and give the shell a distant 

 varicose appearance. The mouth is about the fifth part of the 

 length of the shell. — Lea. 



94. G. gracillima, Anthony. 



Melania gracillima, AxTiiONY, Proc. Acad. Nat. Sci., p. G2, Feb., ISGO. BnmET, 

 Check List, No. 129. Bkot, List, p. 36. Eeeve, Mouog. Melania, sp. 437. 



Description. — Shell conic, thin, brownish; spire very slender, ele- 

 vated, composed of eight, convex whorls, the upper ones folded and 

 striate, the lower ones smooth, the striae being replaced by indistinct, 

 slender, brown lines ; sutures very deeply impressed, a sharp carina 



on the lower portion of each whorl, rendei'ing them ^. ^. 



'^ ° Fjg.415. Fig.41G. 



quite distinct; aperture small, ovate, banded inside; 

 columella indented ; sinus small. 

 Habitat. — South Carolina. 



Observations. — A peculiarly slender, graceful species, 

 Id form somewhat like M. strigosa, Lea, but more folded 

 and more slender. The striae on the upper whorls are very distinct 

 ■where they intersect the folds, and give the shell a tuberculous 

 appearance ; the folds arc arrested by the carina which is elevated. 

 The brown lines on the body-whorl are often slightly elevated, but 

 nevertheless, indistinct and are about four in number. A faint line 

 or band of a yellow color revolves around the upper portion of the 

 two lower whorls.— Anthony. 



L. F. W. S. IV. 14 



