76 
Sliell siibtnrbinated^ with numerous revolving striae and interme- 
diate grooves ; whitish cinereous^ with rufous hands^ 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 undulated lamellee, 
which on the shoulder are elevated into prominent concave spines ^ 
spire prominent ; whirls transversely undulated, the arched scales 
disappearing towards the tip ; aperture effuse ; 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. armigenim 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 Agenville’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 AVARA. — 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 ; labrum denticulated within, but not very percepti- 
bly thickened on the inner middle. 
Length less than half an inch. Inhabits 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 
Maryland. 
