196 DRILLIA. 
D. NIGERRIMA, Sowb. PI. 14, figs. 91, 89, 88, 94. 
Shell very dark chocolate; whorls longitudinally ribbed, the 
ribs terminating on a nodulous periphery, above which the sur- 
face is smooth and slightly concave, lower portion of body-whorl 
with revolving strie. Length, 22 mill. 
Panama to Mazatlan. 
D. cornuta, Sowb., is founded upon a specimen in which the 
callous deposit at the top of the aperture is very thick. D. uni- 
color, Sowb. (fig. 89), D. rustica, Sowb. (fig. 88), D. tiarella, 
Kiener (Pl. 32, fig. 19), D. rugifera, Sowb. (Pl. 12, fig. 22), and 
probably D. Hanleyi, Carpenter (described from a single im- 
mature specimen ), are identical. 
Var. HARFORDIANA, Reeve. Pl. 14, fig. 94. 
Whorls with a narrow yellowish band on the periphery. JD. 
obvellata, Carpenter, described from a single young shell, is 
probably equivalent to this variety. 
D. sicotor, Sowerby. Pl. 14, fig. 100. 
Shell chocolate-brown, with a yellowish band just below the 
periphery; sculpture as in other species of this group. 
Length, 20 mill. Panama; Galapagos Islands. 
D. GRANULOSA, Sowerby. PI. 14, fig. 1. 
Whorls concave and smooth above the periphery, ribbed 
below it, ribs crossed by fine granulated revolving lines; light 
yellowish or pinkish brown. Length, °75 inch. 
Panama, Bay of Montija. 
D. pALLIDA, Sowerby. Pl. 14, fig. 8. 
Ribs deflected at the periphery but continuous to the suture, 
sharp and rather close, interstices with fine revolving striae ; 
sinus broad and deep; canal very short, a little recurved; white. 
Length, 20-30 mill. Panama. 
1). geerA, Lamarek..- Pl. 14, figs: 2, 6,5,411,,12; 7%, 105" Ply oe 
figs. 15, 18. 
Shell orange-, chestnut- or chocolate-color, the duplicate rows 
of tubercles on the periphery white, with frequently one or two 
inferior white bands on the tubercles of the lower part of the 
body-whorl. Length, 20 mill. West Indies. 
A very common species, referred by Kiener to Mauritius, and 
