Serripecten semilaevis (McCoy, 1876)
MCCOY, F. 1876. Geological Survey of Victoria: Prodromus of the palaeontology of Victoria; or, figures and descriptions of Victorian organic remains. Government Printer, Melbourne. Decade 4, 32 pp., pls. 31-40. [p. 13, pl. 34]
1876 Pecten yahliensis var. semilaevis McCoy, 1876
1955 Lentipecten adelaidensis Ludbrook, 1955
1955 Lentipecten adelaidensis Ludbrook, 1955
F. McCoy, 1876, plate 34.
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«Description.—Sub-orbicular, apical angle 145°, ears nearly equal sub-quadrate, sharply defined, anterior ear of right valve notched for passage of byssus of attachment. Right valve deeper than the left one, moderately and evenly convex, most so near the middle; beaks depressed; surface smooth, with irregular lines of growth, strongest on the posterior ear, above the dorsal margin of which they rise as projecting angular scales. Left valve nearly flat, slightly convex in the middle, and slightly concave towards the sides; ears with the posterior one a little longer than the anterior one, but both slightly obtuse-angled; surface radiated with very numerous, sub-equal (or very rarely alternate) nearly straight, narrow, rounded ridges, about one-third of their thickness apart, with an occasional slight irregular flexuosity, crossed by sharp, erect, concentric, scaly laminae of growth, slightly farther apart than the thickness of the ridges (about 8 or 9 ridges in middle of shell in space of 3 lines at 2 inches from beak, about 5 in same space at 4 inches from beak); 6 to 9 narrow radiating ridges on each ear, with transverse scales rather closer than those of body. Length of large specimen, 4 inches 1 line (more commonly about 2 inches); proportional width from beak to opposite margin, 92/100; length of anterior ear, 20/100; of posterior ear, 22/100; greatest depth (about middle) of right valve, 22/100; of left valve, 3/100. Substance of valves thin.»
FREDERICK MCCOY, 1876
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