Pecten (Pseudamusium) [sic] arces Dall, 1913
DALL, W. H. 1913. Diagnoses of new shells from the Pacific Ocean. Proceedings of the United States National Museum, 45: 587-597. [p. 592]
«PECTEN (PSEUDAMUSIUM) ARCES, new species.
Shell hyaline white, with no anterior ear, subcircular, slightly convex; hinge Iine rather long, ligament and pit very small, entire surface of convex valve sculptured with subequal radial threads and similar concentric threads, forming nearly square equal reticulations, about four to a square millimeter; the intersections are slightly prominent on the disk and more or less minutely spinose on the ends of the valve; beside these the entire valve is sculptured with minute equal radial lines, about six to a reticulation; the interior of the valve is glassy, the sculpture showing through. The flatter valve has similar sculpture, with a narrow smooth submargin, a ctenolium of five or six free teeth, a moderately deep byssal notch and five imbricated rays on the ear above the fasciole of the notch.
Height, 35; length, 34.5; diameter, 6.0 mm. Off Santa Barbara, California, in over 500 fathoms, muddy bottom. Cat. No. 267169, U.S.N.M. A neat species, remarkable for the even character of its reticulation and its uniformity over both valves.» WILLIAM HEALEY DALL, 1913
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