Sub-Genus Hiatula. Nob.
Suture channelled. Pillar above smooth, not thickened, beneath tumid, and marked with a few oblique plaits: base of the aperture very wide.
Specific Characters.
Hiatula Lamarci. Fulvous brown: pillar white, with about four lengthened plaits, and intermediate shortened ones between them, inner margin of the lip brown. Fig. 1.
H. pallida. Aperture and base of the pillar livid brown: plaits 4-5, simple, equal; inner margin of the lip pale. Fig. 2.
H. maculosa. Aperture orange, marked above with a black spot: base of the pillar white, the plaits small, crowded, and of unequal length. Fig. 3.
Mus. Nost.
As the connection of the Olives with the Mitres has been illustrated in a former number, we now characterize the sub-genus by which the former are united to the Ancillariæ. The thickened and oblique plaits on the pillar, its smoothness on the upper part, and the great width of the aperture, are all characters which render this affinity unquestionable, and detach the group from the more common and typical Olives before alluded to.