Shell small, depressed trochiform, very thin, narrowly umbilicate, white. Spire low, gradate, about two-thirds height of aperture. Peripheral double keel strong with sharp lamellar edges. Sculpture of crisp lamellar radials, those on the base being finer and much more closely spaced than those above. The radials number twenty-two on the upper surface and about sixty on the base. Interstices crowded with fine spiral lirations, there being about twelve between the suture and the peripheral keels.
Height 1,7 mm.; diameter 1,9 mm. (Holotype).

The distinctive character of finlayi is the discrepant sculpture, few widespaced radials above and much more numerous finer radials below.

Habitat: Off Three Kings Islands, St. 934, 92 m.