71. Anomia furcata, n. sp. Plate IX, figs. 9–10.

Left valve circular to oval, sometimes irregular, convex, thin, semitransparent, radiately costate and with distinct concentric ridges. Beak distinct, nearly smooth, and more or less central; one specimen (fig. 10) has a deep posterior notch, another example has three deep posterior notches, and two shallow ones on the anterior end. The dorsal margin is either straightened or flatly convex. The sculpture consists of narrow, nodulous radial riblets, obsolete in some places, and mostly bifurcating towards the margin. The concentric ornamentation is formed by fine, close, and slightly undulating lines of growth, interspersed with distant stronger ridges. Colour whitish-yellow. Interior of the same colour and somewhat pearly, with a sharp and smooth margin. There is a well-marked transversely elongate ligamental fossette. The upper byssus adductor scar is long, tongue-shaped, the lower small