Pecten (Patinopecten) rhytidus Dall, 1921
DALL, W. H. 1921. Two new Pliocene pectens from Nome, Alaska. The Nautilus, 34 (3): 76-77. [p. 77]
«PECTEN (PATINOPECTEN) RHYTIDUS n. sp.
Right valve very thick and heavy, little inflated, subcircular, with 13 or 14 narrow ribs, here and there subnodulous or slightly imbricated, with much wider flattish shallow interspaces; the whole surface is finely radiately striated; there is no minor sculpture except the striation; the hinge-line long, straight, the ears subequal with coarse incremental sculpture; resiliary pit deep and wide, with a strong groove on each side; adductor scar large; valve-margins undulated by the external sculpture. Height of shell, 128; width of shell, 130; of hingeline, 80; (semi) diameter, 12 mm. U. S. Nat. Mus. Cat. No. 333044. No species of the late Tertiary or Recent fauna resembles this at all closely.» WILLIAM HEALEY DALL, 1921
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