Cyclopecten catalinensis (Willett, 1931)
WILLETT, G. 1931. Three new marine mollusks from Catalina Island, California. The Nautilus, 45: 65-67, pI. 4. [p. 65, pl. 4, figs. 1, 2]
1931 Pecten (Cyclopecten) catalinensis Willett, 1931
G. Willett, 1931, plate 4.
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«Description: Shell small, shining, transparent, very fragile; right valve white, unmarked; left valve with about twenty, somewhat irregular, brown, radial rays, running from the median part of the disk to the margin; these rays show through the transparent shell so plainly that, to a casual inspection, the right valve appears rayed also. Ventral margin of left valve convex ; that of right valve flexible and reflexed when closed. Sculpture of left valve consisting of fine growth lines, crossed, in the umbonal region by very fine, wavy striae, visible only under a strong lens. Ventral two-thirds of right valve marked by fine, closely spaced, incised, concentric lines, with wider interspaces; similar lines also apparent on the anterior auricle above the rather shallow byssal notch. Ears in both valves nearly equal in size. On the left valve the ridges running from the sides of the shell to the umbo, and dividing the discal from the auricular regions, are so sharply defined as to be almost carinate: these ridges, meeting at the umbo, form the two sides of a perfect triangle.
The type. No. 1020 Collection Los Angeles Museum, and another smaller specimen, were taken by the writer in 100 fathoms off White's Landing, north side of Catalina Island, California, July, 1928. The type measures in millimeters: height, 7; breadth, 7.5; hinge line, 5; diameter, 1.6. Remarks: This little pecten appears nearer to Pecten cocosensis Dall than to any other species known to the writer. It differs strongly from that species, however, in more nearly equal ears, lack of spines on the hinge-line, and entirely different color markings.» GEORGE WILLETT, 1931
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