Pecten (Amusium) luna Brown & Pilsbry, 1913
BROWN, A. P. & H. A. PILSBRY. 1913. Fauna of the Gatun Formation, Isthmus of Panama. Part 2. Proceedings of the Academy of Natural Sciences of Philadelphia, 64: 509-519. [p. 514, pl. 23, fig. 1]
«Pecten (Amusium) luna n. sp. PI. XXIII, fig. 1.
A species resembling P. mortoni Conr., from which it differs chiefly by the ears which are depressed below the plane of the valve and separated by a ledge. In P. mortoni the ears are nearly level with the adjacent part of the valve, from which grooves separate them. The hinge-line is short, not serrate above in the right valve, as in P. mortoni. The surface is smooth throughout except for the usual fine growth-lines and fine, indistinct radial striation, such as is seen in P. mortoni. The laterodorsal lines diverge more than in mortoni, forming a greater angle at the beak. The internal ribs run in pairs, spaced about as in P. sol. The shell is rather strongly convex for an Amusium, more convex than in P. mortoni. Alt. 76, length 80 mm.; diam. right valve 12 mm. Gatun Formation at the Spillway. The type is a right valve, which we at first referred to P. sol, from which it differs chiefly by the unsculptured beak and the ledges defining the ears. P. toulae differs by its gray radii.» AMOS PEASLEE BROWN & HENRY AUGUSTUS PILSBRY, 1913
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A. P. Brown & H. A. Pilsbry, 1913, plate 23.
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