Chlamys cellularis Oliver, 1915
OLIVER, W. R. B. 1915. The Mollusca of the Kermadec Islands. Transactions and Proceedings of the New Zealand Institute, 47: 509-568, pls. 11, 12. [p. 554, pl. 12, fig. 46]
«Chlamys cellularis n. sp. Fig. 46.
Description of Type Specimen.— Left valve triangularly orbicular, flatly rounded. Anterior ear one-third the length of the shell, triangular, its outer edge sinuous, a shallow groove and sinus at its inner margin. Posterior ear narrowly triangular. Disc with the dorsal margins sharply descending, very slightly concave; rounded and descending somewhat along the anterior, basal, and posterior margins, which are slightly crenulate. Resilifer obliquely triangular. The epidermis usually persists, especially in the interstices between the ribs, as a cellular covering, giving the shell a characteristic honeycomb appearance. Sculpture: Anterior ear with 6 radiating ribs, the 3 outer ones broad and flattened, the 3 inner ones about half the width of the outer. Posterior ear with small radiating ribs. Disc with 15 principal radiating ribs, the 2 central ones are smaller than the others. The upper surface of the ribs divided by 2 grooves into 3 riblets, of which the central one is largest. In the interstices are 2 riblets in the angles at the bases of the principal ribs, leaving a wide and deep channel in the centre, and grooves the width of the riblets between them and the principal ribs. The surface of the shell presents a microscopically reticulated appearance, apparently due to the growth of the epidermal covering. The marginal portion of the riblets has a series of projecting shelly scales. Interior prominently grooved. Colour white, diffused with pink, chiefly on the ribs, and as 3 concentric broad bands on the upper portion of the disc. Base of ears with pink blotches.
Diameter— Ant.-post., 18-5 mm.; dorso-ventral, 20-2 mm. Variations from Type. — Right valve with the anterior ear oblong, obliquely truncated, a deep byssal sinus below ; posterior ear narrowly triangular. The colour is variable. The irregular pink markings are present on all the specimens seen, and are arranged in more or less defined concentric bands. The ground-colour on one shell is lemon-yellow. Habitat.— The only specimens obtained were single valves found on the beaches at Sunday Island. Fossil.— A valve apparently referable to this species was found on Deyrell Islet in hard sandy tuffs of submarine origin. (Pecten kermadecensis Oliver, Trans. N.Z. Inst., 43, 527, 1911.)» WALTER REGINALD BROOK OLIVER, 1915
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W. R. B. Oliver, 1915, plate 12.
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