DENTALIUM. TOOTH-SHELL. 
3 7 
DENTALIUM. TOOTH-SHELL. 
Shell with a single valve* linear* tubular* not 
divided into chambers* open at one or both ends. 
* 1. Dentalium Entalis. Common Tooth-shell. 
Lister, pi. 547- f. 2, and pi. 1056. f. 4— Pennant , pi. 93. 
f. 5 —Da Costa, pi. 2. f. 10— Donovan , pi. 48— Dorset Cat. 
pi: iS. f. 10. 
Shell slender, tapering, a little curved, opake, glossy, 
open at both ends, smooth or marked with a few circular 
striae or obscure annulations : color white or yellowish- 
white, with mostly a rufous tinge towards the smaller end : 
length an inch and a half; diameter at the larger end two- 
tenths of an inch, and one-fourth as much at the smaller. 
Sandy shores of England and Ireland, v. m. 
2.. Dentalium Dentalis. Small Tooth-shell. 
Shell slender, tapering to a fine point, slightly curved, 
opake, open at both ends, regularly and closely striate the 
whole length, the striae thirty or more in number, with 
often a few faint annulations at the larger end: color 
white or brownish-white, mostly rufous at the smaller end : 
length about half an inch. 
On the western coasts : often found in the stomach of the 
(jurnard. v. m.~ 
3. Dentalium eburneum. Ivory.Tooth-sheU. 
Shell a little taper and slightly bent, open at both ends, 
semitransparent, ivory white but not glossy, often marked 
with obscure dark purple spots disposed in longitudinal 
rows, with regular fine raised longitudinal ribs, eighteen or 
. twenty in number, and generally a smaller one between 
each of them; the lower end not pointed, with a roundish- 
eval aperture: length seven eighths of an inch; breadth at 
the larger end the eighth of an inch, at the smaller end 
about half as much. ' 
This species has been possibly mistaken for the D. Den¬ 
talis, but may be distinguished at a single glance. The 
latter shell is of a brownish color, and conical or funheb- 
e shapQ 
