“Cyamium falklandicum sp. n. (Pl. I., fig. 12).
C. testa mediocri, æquivalvi, inæquilaterali, oblongo-rhomboidali, tenui, albida; valvis sub lente undique concentricé striatis, striis rudibus, posticum apud marginem rugoso-laminatis, umbonibus prominulis, contiguis; valvis dorsaliter posticé leniter declivibus, prolongatis, anticé rotundatis, ligamento corneo, externo, valvam apud rectam dente cardinali magno, bifido, apud sinistram boubus minoribus; superficie interna alba, parum nitente, linea palliali indistincta, paullum sinuosa. Alt. 7, lat. 12, diam. 4 mm.
This interesting addition to a very circumscribed genus has been confused with C. antarcticum Phil., by Gwyn Jeffreys.1 this latter, however, is quite distinct, and correctly-named examples exist in the British Museum, where also is this species without a name. It is smallish in size, equivalve, very inequilateral, rhomboidal, thin, white, the valve concentrically striate, and towards the posterior margin wrinkled-laminate; the ligament is horny and external, the posterior dorsal margin gradually sloping, prolonged, anteriorly rounded, the cardinal tooth in the right valve is large and bifid, in the left there are two smaller teeth; within the surface is white, scarcely shining, the pallial line to some extent sinuous, but not very distinct.”
(Melvill & Standen, 1898)
