DRILL! A. 193 



D. APPELTT, Weinkauff. PL 10, fig. 75. 



Shell narrower than D. callosa, with more numerous ribs and 

 a longer canal ; light ochraceous, indistinctly white-banded. 



Length, 40 mill. 



Habitat unknown. 



D. FUSCESCENS, Gray. PL 14. figs. 97, 98 ; PL 15, fig. 13. 



Shell deep chocolate-brown, the longitudinal ribs separated 

 by wider interspaces, crossed by revolving raised lines, forming 

 granules, above the periphery smooth and slightly concave, with 

 a raised line next the suture. Length, 19 mill. 



West Indies. 



D. solida, Adams, D. cuprea, Reeve (fig. 98), and D. nigres- 

 cens, Gray (PL 15, fig. 13), are synonyms the latter described 

 from a small specimen. D. nigrescens, Adams = nigrescens, 

 Gray, and has priority of publication over that species, as well 

 as fuxcexcens : I think it better not to disturb the well-known 

 name of the species, as Adams' description was not accompanied 

 by a figure, and could not be positively identified until Adams 

 himself subsequently pointed out that it was the same shell as 

 that figured by Reeve as nigrescens. Gray. 



D. HARPULARIA, Desmoulins. PL 14, fig. 99. 



Chestnut- or chocolate-color, spire more slenderly elongated ; 

 canal longer and more compressed than the preceding species; 

 the revolving lines do not form granules on the ribs. 



Length, 1 inch. 



Australia. 



Barely distinguishable from the preceding species with the 

 aid of the different locality. 



D. SCHILINGI, Weinkauff. PL 12, fig. 28. 



Strongly ribbed below the periphery, smooth and concave 

 above it, ribs crossed by spiral striae ; yellowish brown, with 

 chestnut bands ; canal short and wide, subtruncate. 



Length, 18 mill. 



Zanzibar. 

 D. B^TICA, Reeve. PL 12, fig. 26. 



Dark shining chocolate-colored ; ribs prominently pointed at 

 the periphery ; sinus broad and large. Length, 18 mill. 



Habitat unknown. 



