NERITA. NATICA. 53 
inner lip simple, with two teeth above ; columella 
concave in the centre, where are two teeth, cana- 
liculated above. Ii...1;5. W. 36. 44. 
N. unpatTA. 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. 13 
..-15. W. 36. 62. 
N. ANTILLARUM. Ovate, semi-globose ; 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; columeila smooth, 
convex, yellowish, with two obsolete teeth on the 
margin. 17...%. 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, 
