CHEMNiTZiA. Punama Sheik. 165 



ruptly on the periphery of the last whorl : spire with the out- 

 lines nearly rectilinear : whorls eight, very acutely shouldered 

 above,. slightly convex, with a deep .suture; last whorl long: 

 aperture subovate, acute at both extremities: labrum thin: 

 umbilicus wanting. 



Mean divergence about 23°; length .11 inch,; breadth ,043 

 incl^ ; length of spire .07 inch. 



Station. — Unknown. 



Habitat. — Panama ; C. B. A. 1 

 Only 1 specimen was obtained. 



' 221. Clteinnitzia aflinis. Nov. sp. 



Shell long, conic : ipale yellowish brown :: with, on each 

 whorl, about twenty-four rather slender ribs, which terminate 

 abruptly at the periphery of the last whorl ; "Very Bmootb an- 

 teriorly : spire with the outlines nearly rectilinear : whorls ten, 

 moderately convex, with a well impressed stiture ; last whorl 

 angular at the periphery : aperture suboVate : labrum thin : 

 columella rather stout : umbilicus wanting. 



Mean divergence about 18° ; length .21 inch ; "breadth .055 

 inch ; length of spire .165 inch. 



Most easily distinguished from 0. sir'iosa (p. 1B9), by the 

 sculpture of the last whorl. 



iStation. — Unknown. 



Habitat — Panama ; 0. B. A. I 



2 specimens were found in tlae sand. 



222. Chemnitzia clathrattila. Ncsr.sp. 



Shell ovate conic, much elongate: white: with, on each 

 whorl, about thirty minute ribs, which gradually become obso- 

 lete on the periphery of the last whorl, a;nd which are decussated 

 by spiral raised lines, of which five or six appear on the spire 



JULY, 1852. 42 Amk. Ltc. Nat. Hist. 



