GONIOBASIS. 185 



differs in being wider, also in color, and it has no decussating 

 revolving striae. The aperture is more than one-thii-d the length of 

 the shell. — Lea. 



57. G. Curreyana, Lea. 



Goniobasis Curreyana, Lea, Philos. Proc, ii, p. 13, Feb,. 1841. Philos. Trans., viii , 

 p. ISO, t. (i. f. 3G. Obs.,iii, p. 18. Wheatley, Cat. Shells, U. S.,p. 25. BiNNEY, 

 Check List, No. 79. DeKay, Moll. N. Y., p. 97. Reeve, Monog. Melania, sp. 

 286. Tkoost, Cat. Shells, Tennessee. Catlow, Conch. Nomenc, p. 18(i. 

 Brot, List, p. 35. 



Melasma Cttrreyana, Lea, Chenu, Man. de Conchyl., i, f. 2003. Adams, Genera 

 i, p. 300. 



Description. — Shell folded, conical, rather thick, horn-color; spire 

 somewhat elevated ; sutures irregularly impressed ; whorls seven, 

 rather convex ; aperture small, angular below, purplish within. 



JIahitat.— Barren River, Kentucky. Fig. 360. 



Diameter, -27 ; length, -73 of an inch. 



Observations. — Two specimens of this species are before 

 me, which I owe to the kindness of Dr. Currey of Nashville, 

 after whom I name it. It is remarkable for its large and 

 strong folds. It is without striaj, and the body-whorl is 

 smooth, except near to the suture. The aperture is about one-third 

 the length of the shell. One of the specimens has quite a dark 

 purple aperture, and the lip is thickened and reflexed. In these two 

 specimens the ribs seem disposed to alternate in size. — Lea. 



58. G. costifera, Haldeman. 



Sfelania costifera, IIaliiemav, Monog. Melania, No. 2, p. 3 of cover, Jan., 1841. 

 BiNXEY, Check List, No. 72. Bkot, List, p. 34. Keeve, Monog. Melania, 

 6p. 440. 



Description. — Shell lengthened, composed of eight, slightly convex 



„ turns, having numerous, spiral, elevated lines, crossing a 



Fig. 361. 



series of curved ribs, on all the whorls ; spire twice the 



length of the aperture; suture well marked; aperture ovate. 



Habitat. — Hennepin, Illinois. 



Length, 1 inch. 



Observations. — The aperture is wider in the allied species, 

 and the costse are better developed. — Haldeman. 



The plicje are more numerous (though not so prominent in 

 this species) than in Curreyana., the aperture more rounded 

 below and the spire more acuminate. 



