“Falsimargarita n.gen.
Type : Margarites gemma Smith
Eales (1923, p. 8) gave a good description and figure of the dentition of gemma. This and the allied species iris have the radula of the Calliostomid type, that is, with more or less rectangular-based central and lateral teeth having long curved foliaceous cusps bearing numerous sharp denticles.
The shell is very thin, white or pale cream, iridescent both externally and internally, elaborately sculptured with fine crisp spirals and axial threads and with a deep but relatively narrow umbilicus.
This new genus differs from Calliostoma in the thin externally iridescent shell, open umbilicus and in details of the radula. The broad central tooth, more than twice the width of any of the laterals, is a distinctive feature. There is, of course, no relationship to Margarita.”
(Powell, 1951: 93)
