76 



Shell subturbinated, with numerous revolving striae and interme- 

 diate grooves ; wliitisli cinereous, witli rufous bands, and transverse, 

 irregular wrinkles, and obsolete undulations separated by somewhat 

 rugged incisures ; near the base is a band of ten or twelve elevated 

 arched scales, disappearing in the aperture ; whirls flattened above 

 the shoulder, and armed in that part with \uidulated lamellw, 

 whicli on the shoulder are elevated into prominent concave spines ; 

 spire prominent; whirls transversely undulated, the arched scales 

 disappearing towards the tip ; aperture eflFuse ; throat varied with 

 pale green and yellowish, the rufous bands being very distinct ; 

 umbilicus none. 



Length four inches. Aperture two and three-fourths inches. 

 Spire one and a half inch. 



This fine coronated shell, seems to agree better with the descrip- 

 tions of B. armigernm and hezoar, than with those of any other 

 species, as far as I have been able to ascertain. To the latter it 

 seems to be more closely related, with Agcnville's figure of which 

 it corresponds in the form and position of the basal band of scales, 

 excepting that it has this band far more oblique ; that figure, how- 

 ever, is much less elongated than our shell, and it appears to have 

 a double series of prominent scales on the shoulder. The hezoar, 

 moreover, is described to be umbilicated, a character which does 

 not exist in our species. 



COLOMBELLA AVAR A. — Shell Small, covered with a dirty 

 brownish pigment, beneath which it is whitish reticulated or macu- 

 lated with rufous ; spire elevated, acute ; volutions eight, with 

 spiral impressed lines, and transverse elevated obtuse costa ; the 

 costA upon the body whirl are terminated at the middle, and are 

 about eleven in number ; labium with a distinct plate crenated on 

 the submargin j labrum denticulated within, but not very percepti- 

 bly thickened on the inner middle. 



Length less than half an inch. Lihabits the coast of the 

 Southern States. Cabinet of the Academy and Philadelphia Mu- 

 seum. 



Does not fully correspond with the characters of this genus, as 

 the labrum is not very distinctly dilated on the inner middle, and 

 the spire has the elevation of a Mitra. 



It is a common species, and occurs as far north as the coast of 

 Mainland. 



