Cassidae

Cassis nana

Tenison-Woods, 1879

Habitat—Locally it is moderately common on sand bottoms at depths of 50-70m.
Description — Adult shell 30 to 58 mm in length, solid, rotund, with 2 spiral rows of about 8 to 11 even-sized, small
knobs on the shoulder of the dorsum; with a thin, sharp-edged parietal shield and with a well- but finely-toothed inner and outer lip. Suture finely impressed, wavy, and bounded on both sides by weak, tiny knots. Last whorl with 3, rarely 4, spiral, low cords, the upper two bearing 8 to 11 small knobs on the shoulder of the dorsum. Varices 5 to 6. Parietal shield broad, but thin, and with a thin, sharp edge. Columella witli numerous, fine, short, white, spiral plicae. A channellike, smooth depression in the middle gives a gnarled appearance to the inner lip. Glossy, whitish, broad outer lip is bounded on its inner edge by about 14 small denticles. Aperture narrow; white within. Body whorl tan with 4 or 5 narrow, spiral bands of alternating blotches of darker tan and white. Surface with microscopic, axial scratches which give a “silky” or “watery” effect. Siphonal canal short, recurved toward the left.

[Indo Pacific Mollusca, Vol 2 No 9. 1968. p12-497]

Mooloolabah

trawled from 117m
49 mm

Collected 1989

Maroochydore

trawled from 30m
55 mm

Collected 1985

Capre Moreton
Moreton Island

On mud and sand
120-150m depth
Trawled by prawn trawlers
39.5 mm