180 DRILLIA. 
D. CAGAYANENSIS, Reeve. Pl. 11, fig. 79. 
Spire acuminated, whorls strongly angulated at the periphery, 
ribbed below, the ribs crossed by revolving striz, 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. Pl. 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 umbilicated ; 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. ropusta, Hinds. PI. 11, fig. 10. 
Whorls strongly turreted, the spire exserted, periphery angu- 
lated and nodulous, with fine revolving striz; sinus large, pro- 
duced ; yellowish white. Length, 75 ‘inch. 
Hong Kong, China, sandy mud, 4—7 fms. (Hinds). 
D. stnuvosa, Gray. Pl. 13, fig. 45. 
Shell solid, turreted, with a few prominent longitudinal ribs 
terminating at the periphery, crossed by close, strong striz ; 
aperture broadly cut out below, with no 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. unIMAcULATA, Sowb. PI. 10, fig. 59. 
Shell less solid than D. gibbosa, without sutural band or spiral 
strie, 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. 
Very doubtfully admitted as a distinct species from D. gibbosa. 
D. Sowersyl, Reeve. PI. 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? 
