opaque, glossy, smooth or marked with a few circular 
strie or obscure annulations ; white or yellowish white, 
with mostly a rufous tinge towards the smaller end. 
13. Common on sandy coasts. 
D. Dentatts, Turt.D. p.37—An Lin. et auctorum? 
Slender, tapering to a fine point, slightly curved, 
opaque, regularly and closely atriated the whole length, 
the striz about 30 or more, with often a few faint annu- 
lations at the larger end; white or brownish, mostly 
rufous at the smaller end. % W. coast, often found in 
the Gurnard. 
D. Atzum.—Turt. D. p. 256. and D. EBURNEUM. 
p. 37.—A little tapering and slightly bent, semitrans- 
parent, ivory, white not glossy, often marked with 
obscure dark purple spots, disposed in longitudinal 
rows, with about 18 regular fine, raised, longitudinal 
ribs, and often a smaller intermediate one; lower end 
not pointed with a roundish oval aperture. ¢ W. coast, 
not rare; differs from the last in having the strie 
equally strong throughout and in tapering but slightly. 
D. OcrancuLatuM.—Don. t. 162.—An Lam. 5. ? 
An Desh. Mon. Dent. in Z. J. 4. p. 181—StTRIATULUM. 
Turt. D. p. 37. (not Gmel)—D. Striatum. D. p. 
1064. in part.—Slender, tapering to a fine point, 
slightly curved, semi-transparent, with 8 longitudinal 
angular ribs, between each of which are 3 or 4 very 
