GENUSBUCCINUM. 59 



right lip. Specimens have been found in the South Seas, on 

 the coasts of Chili, nearly seven inches in length. 



59. BUCCINUM UNICOLORUM, NOBIS. The Single-colored 



Buccinum. 



(Collect. MASS.) 



PL XJX, fig. 69. 



B. test& ovato-conica, leevi, cinereo-albida, unicolorata ; anfractibus su- 

 perne plicatis, ultimo paulo majore ; spira basi sulcatA ; aperturS. ovata, 

 alba, inttis fulva; labro dextro crasso, infime arcuato, marginato, intus 

 striato. 



Shell ovate, conical, smooth, of a uniform ashy white color ; 

 spire composed of eight whirls ; the upper ones slightly plait- 

 ed, the lowest pretty large, marked with more or less straight, 

 longitudinal lines, approximate, and of a color a little deeper 

 and reddish ; base ornamented with six or seven furrows ; 

 aperture ovate, white, fawn-colored within ; right lip thick, 

 arcuated towards the base, elevated exteriorly into a thick, very 

 prominent margin ; within striated throughout its whole length ; 

 left lip thick, and partially covering the columella, which is 

 adorned with guttules one half of its length ; the first of these 

 guttules, which is uppermost, is much more marked than the 

 others. At the base of the columella is found a very promi- 

 nent fold, terminated by a guttule formed like a flattened point. 



Length 1 inches. Width 8 lines. 

 Inhabits 



This shell, at first sight, would seem to differ essentially from 

 the B. olivaceum ; its form is more elongated, it has not the 

 striae upon the whirls of the spire, and, finally, its whitish color 

 appears particularly to distinguish it from the last. These con- 

 siderations have caused us to regard it as a different species, 

 and yet we are not confident that new observations may not lead 

 to certain gradations which will unite it to the B. olivaceum. 



