200 DRILLIA. 



D. FLAVOCARINATA, E. A. Sniith. (Sculpture like discors.) 



Panama. 



D. NODATA, C. B. Adams. Jamaica. 



D. CLIMACOTA, Watson. Tongatabu. 



Section DRILLIA (Apical). 



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 Alatoe so closely that they 

 might almost as well go into that group, others are onty 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 Pleurotomida? 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. 8PLENDIDULA, Sowb. PL 10, fig. 72. 



Whorls smooth, longitudinally ribbed below the tubercnlate 

 periphery, tubercles and ribs slight, the latter curved, and white 

 upon a brownish rose-colored surface. Length, 28 mill. 



Galapagos Islands. 

 D. SPECTRUM, Reeve. PI. 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. PL 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). 



