200 DRILLIA. 
D. FLAVOCARINATA, E. A. Smith. (Sculpture like dzscors.) 
Panama. 
D. nopata, C. B. Adams. Jamaica. 
D. ctimacota, Watson. Tongatabu. 
Section Dritita (typical). 
The sections of Drillia are all artificial and unsatisfactory— 
this more so than the preceding ones, as it merely includes those 
species which cannot be properly placed under the foregoing 
groups. Some of them resemble the Alatz so closely that they 
might almost as well go into that group, others are only distin- 
guished from the section Clavus by the presence of spiral sculp- 
ture, whilst others again can only be separated from Crassispira 
by arbitrarily fixing the precise degree of solidity necessary to 
enter that group. The great confusion which reigns regarding 
the synonymy and mutual relations of the Pleurotomide forbids 
anything approaching a definite arrangement of the species at 
present; indeed the material is absolutely insufficient. My 
present essay towards a natural grouping of the species will, 
I hope, pave the way for better work hereafter. In no other 
group of the family have the results of my studies been so 
unsatisfactory as in the one now to be considered. 
D. sPLENDIDULA, Sowb. PI. 10, fig. 72. 
Whorls smooth, longitudinally ribbed below the tuberculate 
periphery, tubercles and ribs slight, the latter curved, and white 
upon a brownish rose-colored surface. Length, 28 mill. 
Galapagos Jslands. 
D. specTRUM, Reeve. Pl. 11, fig 83. 
Snowy white, the nodules tinged with light brown; sinus broad 
and shallow, not produced ; outer lip sharp. 
Length, 17:5 mill. Philippines (Cuming). 
A pale, obliquely ribbed species, rather thin. 
D. PUTILLUS, Reeve. PI. 11, figs. 85, 97. 
Yellowish white, chestnut-tinted between the slight longi- 
tudinal ribs; the tuberculate periphery forms a strong angle on 
the whorls; lip simple, thin, sinus broad and shallow. 
Length, 15 mill. 
Philippines, 15 fathoms, coarse sand (Cuming) ; 
N. Australia (Brazier); China Sea (Ads. and Reeve). 
