GENUS BUCCINUM., 19 
19. BUCCINUM CALLOSUM, Woop. The Callous Buccinum. 
(Collect. Mass.) Cuermn. vign. 40, fig. 2. 
Pl. VI, fig. 18 and 19. 
B. testa elongata, cylindriformi, levi, nitidd atro-cinered ; spira elongata, 
acuta, basi cujusque anfractus cinguliferd, albida spadicedque ; apertura 
ovaliformi, dilatata, fulvescente ; columella callosa, levi, arcuata, fulva. 
Shell elongated, cylindrical, the whole external surface 
smooth, shining, of a coffee and milk color; spire elongated, 
pointed, composed of six whirls not convex ; each whirl is 
covered between the sutures with a layer of matter, which 
assumes at the base achestnut-color ; this layer is much thicker 
upon the lowest whirl, and is continued, enlarging itself, to 
the left lip, where it forms a large semicircular callosity, of a 
deep chestnut-color, bordered with white. _Kach of the whirls 
of the spire is likewise separated from the others by a fawn- 
colored line, which is delineated a little below each suture. 
The aperture is ovate, of a pale fawn-color, dilated towards 
the middle, strongly emarginated at its base. ‘The columella 
is arcuated, callous, fawn-colored and smooth ; the callosity of 
the columella is oblique, thick, furrowed, much shorter than 
the right lip; from its lower part, a stria stretches out, which 
is directed obliquely upon the back of the shell, to its termina- 
tion at the anterior angle of the right lip, which is sharp. 
Length 20 lines. Width 8 lines. 
Inhabits 
The Buccinum callosum is easily distinguished from the other 
species ; its cylindrical form, and the layer of calcareous matter 
which covers the whirls of the spire, characterize it with preci- 
sion. In the collection of Prince Massena is found a variety 
of this species which is of a nankin yellow, assuming a deeper 
tint upon the sutures. The interior, in this specimen, is whitish; 
the edge of a bright yellow ; the columella callosity is of a dull 
white. We give this variety, pl. VI, fig. 19. 
