D API! NELL A. 311 



of fine rounded grooves, about fifteen on the body-whorl, sepa- 

 rating evenly rounded ridges about twice as broad as the grooves; 

 these are crossed by about twelve longitudinal rounded ribs, 

 obsolete anteriorly. Length, -46 inch. 



Sitka, Alaska. 



Described from a single specimen and referred to Mangilia 

 with doubt. Not figured. 



D. POLITA, Hinds. PL 20, fig. 97. 



White, polished, angularly ribbed, seven-sided, lip simple, 

 sinus small. Length, 16 mill. 



Straits of Macassar, coarse sand, 7 fms. (Hinds). 



D. FULGURANS, Krauss. PL 22, fig. 59. 



With about eleven narrow longitudinal ribs, short on the body- 

 whorl, with revolving striae towards the base ; sinus scarcely 

 apparent; white, with angular chestnut markings. Length, 6 mill. 

 Cape of Good Hope ; in the byssus of Pinna. 



D. ^ERUGINOSA, Reeve. PL 23, fig. 100. 



Longitudinally ribbed, the interstices with very minute spiral 

 striae ; yellowish white, with a sutural chestnut line, more or less 

 interrupted, a middle line on the body-whorl, interrupted by the 

 ribs, below which the whorl is often stained a darker color, and 

 sometimes an inferior interrupted chestnut line. Length, 10 mill. 

 Hab. unknown (Reeve) ; Indian Ocean ? 



D. PESSULATA, Reeve. PL 21, figs. 36, 37. 



Ribs more or less distant, crossed by somewhat obsolete spiral 

 striae ; lip thin, sinus small ; yellowish or ash-color. 



Length, 12-15 mill. 



Philippines (Cuming) ; Australia (Brazier). 



D. VINCENTINA, Crosse. PL 17, fig. 91. 



Ribs narrow, distant, crossed by distant spiral lirae, which 

 become more crowded towards the base ; sinus shallow ; light 

 yellowish brown. Length, 7 mill. 



Gulf of St. Vincent, Australia. 



D. JACKSONENSIS, Angas. PL 22, fig. 73. 



With somewhat prominent longitudinal ribs, slightly nodulous 

 at the angle of the shoulder, the interstices crossed by narrow 

 21 



