OF CONCHOLOGY. 37 



DESCRIPTION OP TWO NEW SPEOIES OF GONIOBASIS. 



BY S. S. HALDEMAN. 



1. G. GRAMINEA, Haldeman. — t. 1, £ 4. 



Shell fasiforra, sliort, inflated, spire very obtuse; surface 

 smooth, polished, brilliant green, with a light yellow sutural 

 band; spire brownish. Whorls five, somewhat convex. Aper- 

 ture large, rhomboidal, somewhat angular below, bluish 

 within. Columella somewhat curved, tinged with brown. 



Length '06 inch., diam. '3 inch. Aperture "3 inch., diam. 

 •2 inch. 



ffabitaf, unknown. 



This shell is very closely allied to G. Vauxiana, Lea ; but 

 that species is banded, and the spire is carinated ; it has not 

 the light sutural band which distinguishes graminea. 



2. Gr. Catab^a, Haldeman. — t. 1, f. 5, 6, 7. 



Shell short conic, inflated, the whorls flat, the body convex, 

 bright green, polished. Sutures well impressed. Whorls five 

 or six, encircled in the middle with two raised lines. Aper- 

 ture ovate, bluish and translucent within, acuminate below. 

 Columella nearly straight. Some of the specimens are marked 

 in the centre of the body whorl with two very narrow dark 

 approximate bands. 



Length -63 inch., width -34 inck 



Length of aperture '3 inch., width of ditto -17 inch. 

 Habitat Catawba Eiver, near Morgantown, j^orth Carolina. 



This species is nearest related to Cr. proxima, Say, which 

 inhabits the same river. It is, however, a wider^ more inflated 

 species than 0. proxima. 



