DRILLIA. 195 
(Pl. 32, figs. 45,46). D. atrior, C. B. Adams, D. discors, Sowb. 
(Pl. 14, fig. 80), a variety with elevated spire, and strong nodules 
on the periphery, D. Melchersi, Menke (fig. 83), D. rustica, 
Carpenter, and D. zonulata, Reeve (fig. 84), are synonyms. In 
the latter, which may be considered a variety, there is a narrow 
yellowish band, and the revolving ridges are more prominent 
than in the type; it is Pl. cincta, Sowerby, not Lamarck. In 
D. cerithoidea, Carpenter, and its synonym, D. maura, Kiener, 
not Sowerby (PI. 14, fig. 78), the spire is somewhat exserted, an 
accidental variation which occasionally obtains in most species 
having a raised spire. 
D. quADRIFASCIATA, Gray. Pl. 14, fig. 82. 
Shell pyramidal, whoris encircled with a single keel above and 
below, longitudinally closely ridged in the middle ; keels whitish, 
middle of the whorls bluish brown, ridges whitish; aperture 
small; canal very short. Length, 11 mill. Habitat unknown. 
Iam not acquainted with this species. The figure is about 
double the natural size. 
D. pARDALIS, Hinds. PI. 14, fig. 81. 
Shell longitudinally ribbed, ribs curved, interstices with fine 
revolving striz; lip crenulated within; chocolate-brown, ribs 
conspicuously fulvous yellow. Length, 15 mill. 
Gulf of Nicoya, W. Coast Central America. 
D. tuctuosa, Hinds. PI. 14, fig. 86. 
Shell solid, dark chocolate-color, with very fine revolving striz, 
Searcely apparent without a glass, and a single row of minute 
tubercles on the periphery, which also appears on the spire- 
whorls; no longitudinal ribs. 
Mazatlan to San Pedro, Cal. 
The locality “ Bay of Guayaquil” given by Hinds, needs con- 
firmation. 
D. scaraBzus, Reeve. Pl. 14, fig. 87. 
Shell stouily ovate, spire short, apex raised, smooth, spire 
obsoletely hexagonal towards the apex; dark chestnut-brown, 
last whorl encircled with a narrow yellowish zone; apex white. 
Length, 11 mill. Honduras (Dyson). 
I do not know this shell. 
