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 ma}' be considered a variety, there is a narrow 

 j^ellowMi band, and the revolving ridges are more prominent 

 than in the type ; it is PI. cincta, Sowerby, not Lamarck. In 

 D. cerithoidea, Carpenter, and its synonym, D. maura, Kiener, 

 not Sowerby (PL 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, whorls 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. 



I am not acquainted with this species. The figure is about 

 double the natural size. 



D. PARDALIS, Hinds. PL 14, fig. 81. 



fshell longitudinally ribbed, ribs curved, interstices with fine 

 revolving striae ; lip crenulated within ; chocolate-brown, ribs 

 conspicuously fulvous yellow. Length, 15 mill. 



Gulf of Nicoya, W. Coast Central America. 



D. LUCTUOSA, Hinds. PL 14, fig. 86. 



Shell solid, dark chocolate-color, with very tine revolving striae, 

 scarcely 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. scARABvEus, Reeve. PL 14, fig. 87. 



Shell stoutly ovate, spire short, apex raised, smooth, spire 

 obsoletel}' 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. 



