Cyclopecten cocosensis (Dall, 1908)
DALL, W. H. 1908. The Mollusca and the Brachiopoda. Reports on the Mollusca and Brachiopoda [U. S. Fish Commission Steamer ''Albatross'' during 1891 and 1905] region. Bulletin of the Museum of Comparative Zoology at Harvard University, 43 (6): 203-487, pls. 1-22 [p. 405, pl. 6, figs. 1, 3]
1908 Pecten (Cyclopecten) cocosensis Dall, 1908
W. H. Dall, 1908, plate 6.
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«Shell small, suborbicular, translucent whitish, irregularly painted with opaque white, red, and ferruginous brown, in lines, zigzags, or clouded patches; there are also visible on the right valve in some of the specimens whitish rays which would give the impression until the interior is examined that the shell belongs to the Propeamusium group; ears subequal, small, the anterior larger, in the left valve elegantly minutely reticulated and at the hinge line adorned by a series of small, close-set, short, sharp spines; in the right valve the sculpture of the ears is very similar, but the lines are less close and sharp and the anterior auricle has a deep triangular byssal sulcus, without a noticeable fasciole or a ctenolium; left valve with the umbo sharp, small, and prominent, the disk nearly smooth, with faint radial striae which near the submargins become more regular and sharp, especially behind; right valve with a less prominent umbo, the surface polished, the ventral margin flexible, and reflexed when closed; sculpture of fine, close, regular concentric lines with wider flat interspaces; interior smooth, polished, without radial lirae; the hinge line wilh two well-marked transversely striated provincular areas. Height of shell, 8.7; breadth, 9.0; hinge line, 5.0; diam. 2.0 mm.
U. S. S. " Albatross," station 3369, near Cocos Island, Gulf of Panama, in 52 fathoms, rocky bottom, temperature 62°.2 F. U. S. N. Mus. 122,870. The faint white rays on the right valve of this shell look so much like Propeamusium that until T separated the valves of one of the specimens I had no doubt it belonged to that group.» WILLIAM HEALEY DALL, 1908
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