192 DRILLTA. 



D. BARKLIENSIS, H. Adams. PL 13, figs. 70, 11, 77. 



Whorls granulated minutely, with a tuberculated shoulder; 

 chocolate- or orange-brown, the latter often white-banded above 

 the shoulder, and sometimes with an inferior narrow darker 

 band ; tubercles, and usually the granules, white. 

 , Length, 1 inch. 



Mauritius; Neiv Caledonia (Souverbie). 



D. strigata, Sowb. (fig. 71), is a synonym; as is also D. 

 Rougeyroni, Souverb. ^fig. 77), from New Caledonia. 



D. BOTTLE, Valenciennes. PL 13, fig. 74. 



Shell ponderous, dark chestnut or chocolate, with a slight 

 shoulder-angle, above which the whorls are slightly concave to a 

 sutural band ; below the shoulder with close rude longitudinal 

 ribs, sometimes decussated into nodules by the raised revolving 

 lines ; towards the base of the body-whorl the latter remain 

 prominent, whilst the former have vanished. 



Length, l'75-2'25 inches. 



Panama to Mazatlan. 



This species is usually known as D. incrat&ata, Sowb., a name 

 which has priority over D. Bottse, but was unfortunately pre- 

 viously used by Defrance. 



D. CALLOSA, Valenciennes. PL 13, figs. 63, 68 ; PL 30, fig. 79. 



Shell very solid, with a well-defined shoulder, and sulcate 

 space above it; longitudinal ribs low, rounded, closer than in 

 the preceding species, the interspaces being very narrow, crossed 

 b^y raised revolving lines ; chocolate-colored. 



Length (decollated), 1'75 inches. 



West Coast of Africa. 



Very closely allied to D. Bottae. I think D. carbonaria, Reeve 

 (PL 13, fig. 68), is identical, and very likely the next species also. 



D. CONSOCIATA, E. A. Smith. PL 30, fig. 81. 



Whorls doubly carinated at the suture, below which the surface 

 is concave to the periphery ; longitudinal ribs six, strong, crossed 

 by raised revolving lines ; yellowish brown. Length, 24 mill. 



W. Coast of Africa. 



The color is lighter and the ribs less numerous than in D. 

 callosa, yet it is probably only a variation of that species. 



