SEMINELLA. 167 



obsolete on lower part of last whorl ; outer lip denticulate within ; 

 ribs white, sometimes banded with white, blotched or spotted 

 irregularly with iridescent reddish brown, last whorl ornamented 

 with flexuous lines of reddish chestnut. Length, 3 mill. 



Tahiti. 



Varies much in the disposition of its colors, but the opaque- 

 white ribs and flexuous lines on the last whorl are constant. 

 Described by Mr. Pease as Citharopsis ornata, but as Citharopsis 

 is a synonym of Columbella, and as the specific name ornata is 

 preoccupied by Ravenel for a post-pliocene species, I make the 

 change of name as above. 



C. GRACILIS, Pease. PI. 56, fig. 95. 



Shell slender, elongately fusiform, shining; longitudinal ribs 

 usually rather prominent, sometimes evanescent, interstices 

 generally showing revolving striae, lower part of body-whorl 

 distinctly striate ; sometimes the ribs are obsolete and the 

 revolving striae become prominent over the entire bodj^-whorl ; 

 yellowish, sometimes variegated with chestnut, and frequently 

 with chestnut spots arranged in a superior band. 



Length, 4-6 mill Viti Isles. 



Pretty constant in form, but varying in sculpture and coloring. 

 Pease described from a not perfectly adult specimen ; Dunker 

 described the adult under the name of C. pusiola. A portion of 

 the original lot of the latter species is before me. Mr. Garrett 

 believes C. pusiola to = C. lachryma, Gaskoin (p. 165). 



C, T^NIATA, Phil. PI. 56, fig. 96. 



Shell with rounded whorls, and well-impressed suture, spire 

 subturreted; tubercularly ribbed beneath the sutures; yellowish 

 white with revolving lines and blotches of chestnut ; aperture 

 small, lip notched above, denticulate within. Length, 6 mill. 



Mazatlanj Cape St. Lucas. 



G. Gaskoini, Carp., and C. venusta, Reeve (fig. 96), are syno- 

 nyms. 



C. KTROSTBA, Duclos. PI. 56, fig. 9t- 



Shell pure white. Length, 9*5 mill. 



ffabitat unknown. 



I can give no information concerning this shell, which is figured 

 but not described ; it may be colorless from bleaching. 



