159 
DENTALIUM, Linn. 
Gen. Cuar. Shell univalve, tubular, tapering, 
slightly bowed, open at both ends. 
DENTALIUM unitens. 
TAB. LXX.—Figs. 1 and 2. 
Spec. Cuar. Nearly straight; surface even and 
shining; aperture circular; mouth expanded. 
Very gently tapering to the smaller end, at which the 
shell is thickest. From half an inch to one inch and an 
half long. 
Found in the Clay at Highgate in 1811, chiefly in broken 
pieces, with some smaller ones, apparently young of the 
same; they were mostly filled with the Clay, and thin, 
brittle, tender, remarkably smooth and shining. I do not 
know that such have been found elsewhere in England. 
I have received a species resembling it, but rather larger, 
from Avignon, under the title Dentalium cylindricum, by 
favour of my kind friend Mr. Gerville; it is highly polished, 
but is distinguished by little oblong punctures. 
DENTALIUM entalis? 
TAB. LXX.—Fig. 3, 
Spec. Cuar. Slightly arched, surface waved, nearly 
smooth; edge of the mouth acute; apertures 
smooth. 
Syn. Dentalium entalis? Zinn. Syst. nat. ed. 13. 
Tom. 1. p. 3736. . 
ech ace Pov es Se 
Aurnoven this shell is tolerably smooth, the strie of 
growth are here and there more or less conspicuous. 
