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Volume 59, 1928
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– 907 –

Genus Glycymeris Da Costa, 1778.
Type: Area glycymeris Linné.

Glycymeris thomsoni n. sp. (Figs. 18, 21.)

Shell large and strong, oval, inflated. Anterior margin almost regularly convex, dorsal part slightly drawn up. Posterior margin subangled near middle by strong ridge running from umbo. Sculpture of about fifty low almost flat radial ribs with very narrow interspaces, ribs of posterior noticeably narrower, fairly wide space near both anterior and posterior dorsal margins free of these radials.

– 908 –

Whole surface with traces of radial threads, five or six per rib. Ligamental area broad, about half length of shell, with five weak, fairly close, incised chevrons. Hinge-teeth, about four posterior and four anterior fully developed, rest invaded by ligamental area, and almost obliterated. Valve-margins crenulated.

Holotype in Dominion Museum.

Height, 81 mm.; length, 87 mm.; inflation (1 valve), 31 mm.

Easily distinguished from G. subglobosa by the shape.

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