MELANIID^. 253 



aperture ovate, base subproduced. Opercalum three- to four- 

 whorled, nucleus subcentral, rarel}^ subbasal. M. sulcospira, 

 Moussou (Ixx, 81). East Indies. 



NiGRiTELLA, Brot. Shell ovoid-turreted, smooth, but slightly 

 granosel}^ striate. Operculum subspiral, nucleus submarginal. 

 M. decollata^ Lam. (Ixx, 82). Africa, Madagascar. 



MELANOiDES, Olivier. Shell turreted, usually large, elevately 

 striate and plicate, plica^ usually tuberciilose. Operculum sub- 

 trispiral, nucleus excentric, sinistral. East Indies, Philippines. 

 M. asperata. M. variabilis. 31. epii<copalis, Lea (Ixx, 83 i. 



MELANiA, H. and A. Adams. (Ellipstoma, Raf.) Shell usually 

 subulate, whorls numerous. Operculum paucispiral, nucleus 

 submarginal. Jf. hastula (Ixx, 84 ). M. Mindoroensis. M. acumi- 

 nata. East Indies, Pol3aiesia. 



STRiATELLA, Brot. Turrctcd, spirally more or less striate, 

 sometimes longitudinally plicate, aperture rounded at the base, 

 columella a little twisted. M. corporosa. M. tuherculata (Ixx, 

 85). Java, Polynesia. 



PLOTiA (Bolten), H. and A.Adams. Shell medium or small, 

 spirall}' closel}^ striate or lirate ; whorls angulate and spiny above ; 

 corneous, strigate or punctate with red. Operculum subspiral, 

 nucleus submarginal, basal. M. spinulosa. M. bellicosa, Hinds 

 (Ixx, 86). 



PLOTiopsis, Brot. Shell like the preceding, but shortly tuber- 

 culose (not spinose) at the angle. Operculum subspiral, nucleus 

 submarginal. M. Balonnensis, Conr. (Ixx, 8t). 



TIARA (Bolten), H. and A. Adams. (Amarnla, Sowb. Melas, 

 Montf. Melacantha, Swainson. Paramelania, E. A. Smith.) 

 Shell usually large, mostly smooth, rarel}^ with elevated cingulse, 

 whorls angulated and spinose above. Operculum paucispiral, 

 nucleus submarginal. M. amarula. M. setosa, Swains. (Ixx, 88). 



TiAROPSis, Brot. Shell medium size, lirate or sulcate ; whorls 

 with a single row of nodules or short spines above ; margin of 

 the aperture sinuous, if. Winteri, Busch (Ixx, 89). 



TAREBiA, H. and A. Adams. Shell oblong or ovately turreted, 

 granosely decussated ; aperture-margin sinuous. Operculum 

 paucispiral, nucleus submarginal. M. Gelebensis, Quoy (Ixx, 90). 



SERMYLA, H. and A. Adams. Shell Tornatelliform, aljove lon- 

 gitudinally costate, below with revolving lirse ; aperture-margin 

 sinuous. Operculum paucispiral, nucleus submarginal. M. tor- 

 natella, Lea (Ixx, 91). 



ONCOMELANiA, Grcdlcr. Shell rimate, turreted, strongly 

 ribbed, ribs pellucid; aperture scarcelj^ effuse below, small; 

 peristome continuous or connected b}^ a columellar callus, 

 widely sublabiate, with an exterior varix. 1 sp. China. The 

 operculum is of the normal form. The position of this shell is 



