Fig. 2A
Tugalia antarctica Melvill & Standen, 1907: 98, fig. 1
Tugali melvilli Thiele, 1912: 257 (nom. nov. pro T. antarctica Melvill & Standen, 1907 non Strebel, 1907)
Parmaphorella melvilli — Powell, 1951: 87, fig. G3 (radula)
Parmophoridea melvilli — Dell, 1990: 77, fig. 122
Examined material. 3 sh. (MACN-In 40660).
Description. Shell length to 11.7 mm (up to 23 mm according to Melvill & Standen 1907); patelliform, low, moderately thick. Apex rolled, located close to posterior margin. Surface white; sculptured with numerous, low radial ribs and prominent growth lines, which produce small beads at their intersections. Aperture ovate, interior white, margin crenulated. Slit closed.