Pecten (Patinopecten) marshalli Suter, 1913
SUTER, H. 1913. New species of Tertiary Mollusca. Transactions and Proceedings of the New Zealand Institute, 45: 294-297, pls. 12-14. [p. 295, pl. 13, figs. 1, 2]
«Pecten (Patinopecten) marshalli sp. nov. Plate XIII, figs. 1 and 2.
Shell large, inequivalve, subinequilateral, slightly oblique, ears large, the right valve with dichotomous scaly radial ribs, the left valve with distant, broadly rounded radial ribs, slightly more inflated than the right valve. Beaks small, approximate. Ears large, subequal, the anterior somewhat larger, on the right valve with a byssal notch and ctenolium. Anterior end slightly shorter, roundly angled above the middle, dorsal margin concave, descending, margin regularly arched below the angle. Posterior end narrowly convex at the middle, broadly rounded towards the convex basal margin, dorsal margin straight, descending. Sculpture: Right valve having on the anterior ear 2 to 3 strong radial ribs and close, lamellar, sinuous, concentric striae, the posterior ear with inconspicuous radial ribs, rendered scaly by the irregular concentric striae; disc with about 11 dichotomous, narrow, rounded, scaly radial ribs, the division of the ribs beginning at the umbo, occasionally some ribs are trichotomous, and the width of the ribs is very variable; the interstices between the ribs are mostly of the same width as the ribs; the whole surface ornamented with distant concentric striae, imbricating the ribs. Left valve with subequal triangular ears, the anterior ear with fine radial riblets crossed by distant laminar concentric striae ; the posterior ear without distinct radial riblets, but rather distant lamellar concentric striation; disc with 11 subequidistant, high, rounded radial ribs, the 3 posterior interstices with a low, broadly rounded rib in the centre, bringing the total number of ribs up to 14; the whole surface with fine, dense concentric striation. Margins smooth inside. Hinge-plate solid, with a large, oblique, triangular resilifer, directed forwards. Adductor-scar very large, rounded, slightly longer than high, vertically striated, situation central or slightly posterior.
Right valve: Height, 115 mm.; length, 120 mm.; diameter, 20 mm. (holotype). Left valve: Height, 107 mm.; length, 108 mm.; diameter, 25 mm. (holotype). Holotypes in the collection of Dr. P. Marshall, Otago University, Dimedin. Locality.—Muddy Terrace, Waikaia (Dr. P. Marshall). Miocene. Remarks.— The upper part of a right valve from limestone on coast, ten miles north of Eaglan (loc. 97), is in the Museum of the Geological Survey, Wellington. This specimen has the anterior ear in perfect condition.» HENRY SUTER, 1913
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H. Suter, 1913. plate 13.
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