DRILLIA. 189 
coccinata, but that shell is more numerously ribbed and more 
slender: 
D. THEA, Dall. PI. 34, fig. 1. 
Whorls eight, ashy olivaceous, covered with a shiny very 
thin epidermis, claret-brown within the aperture; with eleven 
short, oblique, slightly curved ribs, more prominent on the 
periphery and fading away above it; with evanescent spiral 
strie, not always visible, and some stronger raised threads 
towards the base. Length, 15 mill. 
Sarasota Bay, W. Coast of Florida, 
on mud-flats between tides (Hemphill). 
D. rmprEssA, Hinds. PI. 13, fig. 53, magnified. 
Tuberculately ribbed, ribs oblique, interstices transversely 
striated, back of the last whorl smooth; pale flesh-color, ribs 
whitish ; outer lip a little expanded, Length, 9 mill. 
W. Coast Central America. 
A species having no very distinctive characters. 
D. pupica, Hinds. PI. 13, fig. 55. 
Whorls shortly obliquely ribbed, the ribs obsolete on the 
back of the last whorl, depressed below the sutures; yellowish 
brown, with a deep reddish chestnut spot on the back of the 
body-whorl; canal rather long. Length, 13 mill. 
West Coust of Central America (Hinds). 
D. FucaTA, Reeve. PI. 11, figs. 86, 93. 
Shell obsoletely channeled above the periphery—which is not 
prominently angulated; longitudinal ribs numerous, rounded, 
not prominent, not interrupted on the periphery but continuous 
to the suture; sometimes obsoletely spirally striated; back of 
body-whorl with a peculiar hump or longitudinal varix ; yellow- 
ish white, banded and maculated with yellowish or orange-brown. 
Length, 21 mill. West Indies. 
D. paria, Reeve (fig. 93), is a synonym; the characteristic 
broad faint yellowish band is mentioned in the description, 
although not well indicated in the figure. 
PD. REGULARIS, Reeve. Pl. 13, fig. 52 (fig. 14 nat. size). 
Shell somewhat pyramidally ovate; whorls concave round the- 
