CHEMNITZIA. Panama Shells. 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 

 inch ; length of spire .07 inch. 



Station. Unknown. 



Habitat. Panama ; C. B. A. ! 

 Only 1 specimen was obtained. 



221. Chemiiitzia affiiiis. Nov. sp. 



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

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

 abruptly at the periphery of the last whorl ; very smooth an- 

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

 moderately convex, with a well impressed suture ; 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 C. striosa (p. 169), by the 

 sculpture of the last whorl. 



/Station. Unknown . 



Habitat. Panama ; 0. B. A. ! 



2 specimens were found in the sand. 



222. Cheiunitzia clathratula. Nov. 



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, and which are decussated 

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



