COLUMBELLA. Panama Shells. 85 



In Chenu, the figures of both species have the ribs prolonged. 

 In these figures the ribs are more distant in C. costellata than in 

 0. scalarina. The figure of the former very exactly represents 

 our shells. 



Station. A single specimen was found at the depth of 16 

 fathoms : Cuming ! Sowerby. Our specimens were found under 

 stones near low water mark. 



Habitat. Panama ; Cuming ! Sowerby : also Miiller. 



Panama and coast of Africa ; Gray. 



Panama ; C. B. A. ! 



We collected 25 specimens on the reef. Mr. Gray must be 

 in error when he includes the coast of Africa in the habitat. 



82. Columbella diiiiiiinta. Nov. sp. 



Shell subfusiform : pale yellowish brown, black or brownish 

 black anteriorly .: ribbed, with the interstices covered with spiral 

 strife, which are coarser anteriorly where the ribs are obsolete ; 

 apex acute : spire conic : whorls seven, scarcely convex : with 

 the suture lightly impressed : aperture rather narrow : labrum 

 variciform, broadly thickened, sinuate posteriorly, crenulated 

 within : columellar lip with the granules obsolete. 



Mean divergence about 45 ; length, .155 inch ; breadth, .07 

 inch ; length of spire .08 inch. 



This species resembles a dwarfed C. nigrescens. 



Station. Under stones near low water mark we found this 

 shell. 



Habitat. Panama ; C. B. A. ! 19 specimens were obtained. 



83. Coliimbella dorsata. 



Synonymy. 



Columbella dorsata Sowb. in Proc. Zool.Soc. Loncl.p. 120. June 1832. 



Miillor Rynop. Nov. Test. Viv. p. 91. May 1836. 

 Reeve Conch. Syst. pi. 257. f. 7. 1842. 



