Dichotochlamys dichotomalis (Tate, 1886)
TATE, R. 1886. The lamellibranchs of Older Tertiary of Australia (part 1). Transactions and Proceedings and Report of the Royal Society of South Australia, 8: 96-158, pls. 2-12 [p. 106, pl. 9, figs. 3a-c]
1886 Pecten dichotomalis Tate, 1886
R. Tate, 1886, plate 9.
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«Shell suborbicular, fan-shaped, thin, equilateral, inequivalve, umbos depressed. Right valve regularly slightly convex, with about nine broad radial undulose folds, whole surface ornamented with flat riblets narrower than the interspaces which are crossed by raised threads about half the width of the alternating grooves. The riblets increase in number to more than 100 by two successive bifurcations at irregular intervals, and towards the margin are covered with minute imbricating scales; front margin undulate and minutely crenulated. Ears unequal, dorsal line distantly serrately fringed; anterior ear slightly sinuated on the underside, with five to six radial ridges covered with small triangular serratures; posterior ear triangular, slightly obtuse-angled, with seven to eight serrated ridges. Left valve flat, with the radial folds angular, the riblets stouter and less numerous, the anterior one-fourth of the surface densely covered with conspicuously large, erect scales. Ears large, equal; radial ridges about three on which are a few scattered, erect, triangular scales.
Dimensions.— Length, 32; height, 30; thickness through both valves, 4·5 millimetres. Locality.— Schnapper Point, Hobson's Bay (P. T.).» RALPH TATE, 1886
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