180 DRTLLIA. 



D. CAGAYANENSIS, Reeve. PI. 11, fig. 79. 



Spire acuminated, whorls strongly angulated at the periphery, 

 ribbed below, the ribs crossed by revolving striae, forming low 

 tubercles ; sinus wide, ascending ; white. Length, 18 mill. 



Philippines (Cuming). 



Is very probably identical with D. alabaster, Reeve. 



D. VARIABILIS, E. A. Smith. PI. 11, figs. 81, 92. 



Yellowish brown, sometimes irregularly maculated with 

 chestnut, with chestnut spots on a narrow band below the 

 suture; spire long, turreted ; slightly umbilic.ated ; sinus large, 

 ascending. Length, 1*25 inches. Andaman Islands. 



The spire is longer and the color different from D. alabaster, 

 Reeve, but it is very likely a variety of that species. 



D. ROBUSTA, Hinds. PL 11, fig. 10. 



Whorls strongly turreted, the spire exserted, periphery angu- 

 lated and nodulous, with fine revolving striae ; sinus large, pro- 

 duced ; yellowish white. Length, 15 'inch. 



Hong Kong, China, sandy mud, 4-7 fms. (Hinds). 



D. SINUOSA, Gray. PI. 13, fig. 45. 



Shell solid, turreted, with a few prominent longitudinal ribs 

 terminating at the periphery, crossed by close, strong striae ; 

 aperture broadly cut out below, with up proper canal ; sinus 

 large, ascending. White, or brownish with white ribs, or whitish 

 indistinctly maculated or centrally banded with light brown. 



Length, -75 inch. Habitat unknown. 



D. UNIMACTJLATA, Sowb. PL 10, fig. 59. 



Shell less solid than D. gibbosa, without sutural band or spiral 

 striae, the knobs on the periphery rather short, instead of 

 terminating ribs as in D. gibbosa; yellowish brown, spotted with 

 chestnut, one large spot on the back of the body-whorl. 



L. 38, diam. 13 mill. Panama. 



Yer} r doubtfully admitted as a distinct species from D. gibbosa. 



D. SOWERBYI, Reeve. PL 10, fig. 67. 



Turreted, with a nodulous sutural band and nodulous periphery, 

 the latter terminating longitudinal oblique ribs, which are sharply 

 decussated by revolving sculpture ; chestnut-brown. 



L. 44, diam. 14 mill. China ? 



