194 DRILLTA. 



D. FLAVESCENS, Reeve. PL 14, fig. 96 ; PL 21, fig. 22. 



Yellowish olive ; sculpture like D.fuscescens, except that there 

 is no revolving line below the sutures. Length, 17 mill. 



Wnst Indies. 



The lighter color and want of sutnral line are not very good 

 distinguishing characters, and it is probable that this species 

 should be united with D. fuscescens. D. affinis, Gray (PL 21, 

 fig. 22), appears to be a synonym. 



D. HONDURASENSIS, Reeve. PL 14, fig. 95. 



Whorls nodosely ribbed, with revolving strife, and a smooth 

 space below the sutures ; alternately banded with yellow and ash- 

 color. Length, 8 mill. 



Honduras (Dyson). 



I am not acquainted with this little species. The figure is 

 about double the natural size. 



D. PAXILLUS, Reeve. PL 14, fig. 92. 



Shell short and stout, the spire acuminated at the apex ; whorls 

 concave round the top, with a small keel, very closely plicated 

 in the middle, interstices between the folds finely striated, ridged 

 round the base, sinus large; chocolate-brown. Length, 9 mill. 



Habitat unknown. 



Notwithstanding some difference in form and the much smaller 

 size I think it very probable that this will prove to be synony- 

 mous with D. fuscescens ; the sinus, however, is said to be large, 

 whereas in the latter it is very small. 



D. ATERRIMA, Sowerby. PL 14, figs. 78, 79, 80, 83, 84 ; PL 32, 

 figs. 45, 46. 



Shell very dark chocolate, with sometimes a narrow white line 

 above the periphery, but this is usually absent; spire lengthened 

 or short ; whorls rudely prominently keeled on the periphery, 

 which is nodulous ; below the keel are a few raised revolving 

 lines, occasionally broken up into granules. Length, 15 mill. 



Panama to Gulf of California. 



The great variation in the proportions of this shell has caused 

 a number of synonyms to be made, and the confusion has doubt- 

 less been increased by the uncharacteristic figure given by Reeve 

 (fig. 79). I add better illustrations from Weinkauff's monograph 



