8-i Panama /Shells. PURPURID^E. 



cute ; spire with the outlines nearly rectilinear ; whorls eight, 

 convex, with a moderately impressed suture ; last whorl sub- 

 angular ; aperture a little wider above ; labrum moderately 

 thickened, with a few wrinkles on the inside : notch wide and 

 deep. 



Mean divergence about 35 : length .21 inch ; breadth, .1 inch ; 

 length of spire, .12 inch. 



Station. Unknown. 



Habitat. Panama ; C. B. A. ! 



Only one specimen of this elegant shell was found. 



81. Columbella costellata. 



/Synonymy. 



Columbella costellata Brod. and Sowb. in Zool. Journ. 



IV. 376. 1829. 



Sowb. in Proc. Zool. Soc. Lond. 



p. 118. June 1832. 



Mull. Synops. Nov. Test. Viv. p. 88. May 1836. 



Gray in Zool. Beech. Voy. pi. 36. 



f. 9? 1839. 

 Duel, in Chenu 111. Conch, pi. 25. f. 



11, 12. 1843. 

 Sowb. Thes. Conch, p. 137. No. 79. 



pi. 39. f. 147. 1844- 



We have had some difficulty in determining whether our 

 shells belong to this species or to C. scalarina. Taking the 

 descriptions and figures by Mr. Sowerby, the ribs in C. costellata 

 are said to fall far short of the anterior extremity, but to be pro- 

 longed in C. scalarina, although the figures of these species ex- 

 hibit no difference in this respect : most of our specimens have 

 them prolonged, but the character is not constant. In other 

 respects the figures of the two species are very different, and 

 that of C. costellata well represents our shells. Many of the 

 specimens are larger than this figure. 



