356 HELICINAD-^. 



3. HELICINA OCCULTA, Say. 



Plate LXXIV. Figure 2. 



H. testa parva, solidula, conico-orbiculari, cretacea, stria- 

 tula ; anfractibus quinque, convexiusculis, ultimo angulato; 

 sutura linear!, marginata ; apertura parva, lunata ; labro 

 incrassato, ad columellam baud angulato. 



SYNONYMS AND KEFERENCES. 



Olygyra occulta, Say, Journ. Acad. Nal. Sc. I. 1S2. 



Ilelicina occulta. Say, Transylv. Journul of Mt'dicine, IV. 529 ; 



Desur. of New Terr, and Fluv. Shells, (from tlie 

 Dissemlnalor,) p. 15; 



American Conchology, pi. 4C. figs. 1, 2, 3. 



DESCKIPTION. 



Shell small, rather solid, low corneal, acute at apex, 

 cretaceous, obviously striated ; spire of five nearly plane 

 ■wtorls, the last of whicli is angular at the perii^hery, and 

 this angle continuing up the spire adjacent to the suture, 

 makes it appear double. The aperture is small, semi- 

 lunar ; the hp is scarcely refle.xed, but is thickened 

 internally ; the columella is very short, and joins the lip 

 by a slightly waving curve, without forming an angle. 



Diameter one-fourth of an inch ; length of a.xis one- 

 fifth of an inch. 



Geographical Distribution. Found in Indiana, 

 Ohio, Mississippi, and probably throughout the valleys of 

 the Ohio and lower Mississippi. 



