opaque, glossy, smooth or marked with a few circular 

 striae or obscure annulations ; white or yellowish white, 

 with mostly a rufous tinge towards the smaller end. 



li. Common on sandy coasts. 



D. DENTALIS, 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 striae 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, of ten found in 

 the Gurnard. 



D. ALBUM. Turt. D. p. 256. awe? 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 strice 

 equally strong throughout and in tapering but slightly. 



D. OCTANGULATUM. Don. t. 162. An Lam. 5. ? 

 An Desk. Mon. Dent, in Z. J. k.p. 181 STRIATULUM. 

 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 



