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“Genus Falsilunatia n.g.
Type : Natica soluta Gould, 1848
On shell and opercular characters soluta is not dissimilar from catena Da Costa, the Recent English genotype of Lunatia, but the dentition is most distinctive.
In catena the radula is normal for the family—a tricuspid central tooth of more or less rectangular form, laterals with three or four cusps and the inner marginal with a side cusp, thus approximating the bifid form. In soluta the central tooth is hemispherical with a large, broadly triangular central cusp but merely vestigial side cusps. The laterals have a broad massive cusp with a slight incision or incipient denticle near the base of its inner margin. The marginals are simple, not bifid, the outer one the longer.
The umbilicus is narrower than in Lunatia and may be open or closed according to the relative downward encroachment of the parietal callus.”
(Powell, 1951: 119)