DRILLIA. 189 



coccinata, but that shell is more numerously ribbed and more 

 slender. 



D. THEA, Ball. 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 

 striae, 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, IMPRESSA, Hinds. PL 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. PUDICA, 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 Coast 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. 



D. EEGULARIS, Reeve. PI. 13, fig. 52 (fig. 1^ nat. size). 



Shell somewhat pyramidally ovate ; whorls concave round the 



