Cyclopecten davidsoni (Dall, 1897)
DALL, W. H. 1897. New West American shells. The Nautilus, 11 (8): 85-86 [p. 86]
1897 Pecten davidsoni Dall, 1897
Propeamussium (Parvamussium) davidsoni (Dall) 1897; G. Grau, 1959, Pectinidae of the Eastern Pacific, plate 4.
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«Shell small, suborbicular, compressed, waxen white, the left valve with 21 rounded ribs, surmounted by (when not worn off) continuous rows of minute subglobular scales, the interspaces wider, flat and perfectly smooth, ears very small, the anterior with five or six imbricated radii; sculpture obsolete near the umbones; right valve sculptured with faint concentric impressed lines over the whole surface, and distally with numerous minute, obsolete, fine, scaly riblets; posterior ear transversely striated, very small, anterior one with four or five scaly radii, a well marked sinus leaving an imbricated fasciole and no ctenolium. Interior polished, the left valve fluted internally in harmony with the external ribs. Alt. 14, lat. 14, diam. 3'5 mm.
On the Davidson Bank, Alaska, in 280 fathoms, green mud, and north of Unalashka, in Bering Sea, in 351 fathoms, sand; U. S. Fish Commission. This little shell resembles somewhat P. (Propeamusium) alaskensis Dall, externally, but wants the radiating lirse internally, is smaller, and has faint radiating sculpture on the right valve, which is wanting in P. alaskensis.» WILLIAM HEALEY DALL, 1897
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