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Trigonostoma tessellum Garrard, 1975 Description: Whorls strongly shouldered, area between shoulder and suture narrow, concave, crossed obliquely by axial ribs. Sculptured with lamellate axial ribs, about 17 per whorl, crossed by strong spiral ribs, about 4 on body whorl, with finer riblets between. Umbilicus widely open; inner lip reflected partly over umbilicus; columella with two weak plaits deep with the aperture. Outer lip thin, crenulated, smooth internally or sometimes with weak denticles near outer edge. Colour fawn, occasionally with one or two light brown bands. Size: Up to 23 mm in length. Distribution: Endemic to Australia: Cape Moreton, Queensland, to Coffs Harbour, NSW. Habitat: Known from 50-120 metres. Uncommon. Comparison: This species, along with T. laseroni, has two plaits on the columella, and a wide umbilicus. Species in the genus Scalptia have three plaits on the columella. Figs. 1,2,3 Off Yamba, NSW, in 49 m (C.096136)
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