DRILLIA. 179 



D. GIBBOSA, Born. PI. 9, fig. 54. 



Yellowish white or brownish, usually interruptedly broad- 

 banded above and below the middle of the last whorl ; spire 

 turreted, the whorls with a sutural cord, and smooth, slightly 

 concave shoulder, the periphery nodulous with the terminations 

 of oblique, longitudinal ribs, which are crossed by strong 

 revolving lines ; labium with a very strong projecting superior 

 callus ; outer lip winged, with a second small sinus indicated 

 towards the base. L. 60, diam. 20 mill. West Indies. 



Allied to D. flavidula, but heavier, with shorter canal, and 

 usually differently colored in having the pair of more or less 

 interrupted, and mostly faint-colored bands. 



D. ALABASTER, Reeve. PI. 11, fig. 78. 



Shell turreted, snowy white, sometimes faintly rose-tinged ; 

 longitudinally ribbed, with very fine revolving grooves and 

 striaB ; somewhat depressed next the suture ; sinus broad. 



Length, 30 mill. 



Philippines (Cuming) ; Darnley /., Australia (Brazier). 



The sculpture is exceedingly delicate, the cross-grooves 

 looking as if they had been graved with an etching point. 



D. UMBILTCATA, Gray. PI. 11, figs. 82, 91 ; PL 8, fig. 24 ; PI. 30, 

 fig. 78. 



Shell light yellowish brown or yellowish white; with promi- 

 nent, distant ribs, forming a strongly tuberculate shoulder, and 

 revolving striae ; sinus produced upwards ; inner lip thickened 

 below, forming with the axis a false umbilicus. 



Length, 1*2 inches. 



Sierra Leone (Gray) ; West Indies (Swift). 



Z>. Dunkeri, Weinkauff (PL 8, fig. 24 , is an immature example 

 of this species. D. Saulcydiana, Recluz (fig. 91), varies a little 

 in sometimes possessing a broad indistinct central band of light 

 chestnut ; the shells are adult, although not so large as the type. 

 Of its identity with D. umbilicata there can be no question. 



D. ROSACEA, Reeve. PL 13, fig. 51. 



Longitudinally closely ribbed, with fine revolving striae, con- 

 cave and smooth above the periphery ; canal very short, sinus 

 broad and large ; rose-colored throughout. Length, 20 mill. 



W. Coast of Africa (Maltzan). 



