NERITA. NATICA. 53 



inner lip simple^ with two teeth above ; columella 

 concave in the centre, where are two teeth, cana- 

 liculated above. 1^ . . . lyV- W. 36. 44. 



N. UNDATA. Ovate, semi-globose, with thirty 

 furrows; spire acute, rather exserted; aperture 

 white; outer lip crenate within, two-toothed above; 

 columella convex, wrinkled, sprinkled over with 

 raised dots; its margin with three unequal teeth. 

 This shell is coloured by large oblique alternate 

 tawny white and blackish-brown flammules. l^ 

 ...IxV W. 36. 62. 



N. ANTiLLARUM. Ovatc, scmi-globosc ; apex 

 very blunt ; transversely ribbed ; ribs deep black, 

 nearly equal ; interstices white ; aperture narrow, 

 semi-lunar; outer lip slightly denticulated, with 

 rather a produced tooth above ; columella smooth, 

 convex, yellowish, with two obsolete teeth on the 

 margin. If . . . f . W. 36. 45. 



NATICA. 



Sub-globose, umbilicated; aperture entire, and half 

 rounded; outer lip oblique, without teeth; a 

 callosity partly covers the umbilicus, and in 

 some species entirely ; outer lip sharp), smooth 

 within; aperture provided with an operculum. 



N. GLAUCINA. Sub-orbicular, inflated, thick, 

 smooth, fulvous and bluish white ; spire short. 



