“MARGARELLA MACQUARIENSIS sp. nov.
(Plate V., figs. 56, 57.)
Shell depressed-spherical, rather solid, imperforate when adult, polished. Colour ash purple. Whorls four and a half, rather rapidly increased, well rounded at periphery, slightly descending at the last, parted by impressed sutures. Under the lens the surface, smooth to the eye, is seen to be sculptured by dense, fine, hair radials. Aperture oblique, semilunate, outer lip simple thin. Base tumid; in the young, till three whorls old, the shell is narrowly perforate, the umbilicus over-arched by a lobe of the columella lip, which later becomes appressed to the base. In the adult the basal axis is overspread by a thick crescentic callus, slightly tinged with green and excavate medially. Height, 8; maj. diam., 9; min. diam., 7.5 mm.
Twenty specimens were taken, January 19th, 1913, by Mr. H. Hamilton, at Aerial Cove, Macquarie Island. He notes that the species occurred sparingly under stones. Compared with M. expansa Sowerby, this is smaller, more depressed, more solid, and of a paler colour.”
(Hedley, 1916: 36)
Margarella macquariensis is a species of marine gastropod mollusc in the family Trochidae, the top shells.
The shell grows to a height of 11 mm; its diameter is also 11 mm.
This marine species has only been found off the Macquarie Islands.
Margarella macquariensis is a species of marine gastropod mollusc in the family Trochidae, the top shells.
