Moderately thick, irregularly, elongately, and somewhat obliquely orbicular, depressed; white, yellow, pink, reddish-brown, brownish-black, with irregular light or dark bands, and peculiarly marked with numerous small, sharply angular patches of white, pink or darker; interior shining pinkish white, with exterior colouration faintly showing through; sculpture of from 14 to 24 radiating, imbricated ribs, which are alternately large and small, or as many groups of two or three subequal ribs; shagreen sculpture in the interspaces; lines of growth irregular and prominent; ears unequal, radiately ribbed, the posterior auricle very small and curiously folded in, so that at first sight it appears to have broken off. Length 25 mm., height 28 mm., section 8 mm. Type locality: north-west coast of Tasmania.

Loc.: Port Phillip to Albany, dredged 13-35 fathoms; single valves not uncommon on beach. S.W.A., S.A., Tas., Vict.

Remarks: Distinguished from B. asperrimus by the very small posterior auricle and fine shagreen sculpture; also the ribs increase in number by prickly serratures. Synonyms are Pecten bednalli Tate 1886, S.A., Aldinga Bay D.14170 and Pecten pulleineanus Tate 1886, S.A., S.E., D.14171.

As Chlamys bednalli (synonymous)
Shell small, much higher than long and very shallow. Colour reddish-brown, passing into yellow at the apex, irregularly splashed with dark brown and opaque white. Anterior auricles largely, posterior moderately developed, anterior with six, posterior with four strong radiating, nodulose ribs. The radial ribs of the valve number about sixteen; they increase either by interpolation or by an even Splitting of the primary ribs; their interstitial grooves are broad and deep. This sculpture scallops the margin and prints the anterior. The whole external surface is covered by minute, frail, imbricating scales; arched in the grooves and flat on the ribs. The ctenolium has five well developed and one rudimentary tooth, crowded together. Hinge plate broad. One faint cardinal rib on either side. Resilium small. Chondrophore well within the margin. Height 24, length 20,5, breadth of conjoined valves 7 mm.
Location: Off Green Point, Port Jackson