DRILLIA. 1 87 



D. formosa, Reeve (PI. 11, fig. 87, double natural size), 

 appears to be identical ; it comes from the Philippine Islands. 



D. HEXAGONA, Sowb. PI. 9, fig. 35. 



Shell sharply pyramidal, reddish brown, whorls hexagonal, 

 very finely striated, ribbed-tuberculated, the ribs six on each 

 whorl ; sinus broad. Length, 23 mill. 



Guacomayo, Central America (Cuming). 



Dr. WeinkaurT's figure of this species is not at all character- 

 istic, and resembles D. Beckii, Reeve. 



D. POLYGONALIS, Weinkauff. PI. 9, fig. 45. 



Whorls nine, contracted above, convex on the middle, with 

 longitudinal, curved nodulose ribs ; white, with a chestnut band ; 

 canal very short, broadly emarginate at the base. 



Length, 14 mill. Zanzibar. 



Said to resemble closely D, unizonalis, but to be much'smaller 

 and more slender, with more numerous whorls. 



D. ANGASI, Crosse. PL 9, figs. 37, 36, 



Shell brownish olivaceous, whorls about nine, the embryonal 

 whorls smooth, the others with from seven to ten short longitu- 

 dinal costse forming a tuberculated shoulder, surface often with 

 minute revolving striae ; aperture chestnut-brown. 



Length, 11-13 mill. 



Port Jackson, Australia; Tasmania. 



Having received this species from several collectors and con- 

 chologists I find considerable variation in the number of ribs 

 and in the proportions of the shell, some having a longer spire 

 and narrower form even than the figure of D. Angasi, whilst 

 others are short and stout, as in the form called by Crosse D. 

 Beraudiana (fig. 36) ; sometimes there is a brown band below 

 the middle of the body-whorl. 



D. MEDIOCRIS, Deshayes. PI. 9, fig. 41. 



Whorls eleven, nodosely plicate in the middle, the body-whorl 

 with revolving striae towards the base ; flesh-brown, with a cen- 

 tral interrupted narrow chestnut band, base broadty chestnut- 

 banded. Length, 11 mill. 



Isl. of Bourbon. 



Described from a single specimen which I have not seen. 



