Pecten natoriensis var. subovalis Matsumoto, 1930
MATSUMOTO, H. 1930. On the Marine Faunae of Three Fossil Zones of the Upper Miocene of Natori District, Province of Rikuzen. The Science Reports of the Tōhoku University [2nd. Series -Geology], 13 (3): 96-109, pls. 39, 40. [p. 105, pl. 40, fig. 12]
«Pecten natoriensis var. subovalis, nov.
PI. XL (11), Fig. 12. Very similar to the typical form of the species, though is distinguished at once from it by the shell, which is longer than wide. The shell looks oval and is equilateral, except for the ears.
One specimen with both valves in situ measures 89 mm. in length, 85.6 mm. in width and 43.5 mm. in transverse diameter. In this shell, the right valve is slightly more convex than the left. One right valve measures 63 mm. in length, 61 mm. in width and 13 mm. in convexity. Rather rare. Age: Upper Miocene.» HIKOSHICHIRÔ MATSUMOTO, 1930
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H. Matsumoto, 1930, plate 40.
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