Chlamys insolita (Yokoyama, 1925)
YOKOYAMA, M. 1925. Tertiary Mollusca from Shinano and Echigo. Journal of the Faculty of Science, Imperial University of Tokyo [Section II: Geology, Mineralogy, Geography, Seismology], 1 (1): 1-23, pls. 1-7. [p. 18, pl. 5, fig. 3]
1925 Pecten insolitus Yokoyama, 1925
M. Yokotama, 1925, plate 5.
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«Only a right valve present. It is smali, thick, compressed, orbicular, radiately ribbed. Ribs about twenty, subequal, broad and squarish, inequidistant, the interspace usually narrower and provided with a riblet which fills its greater part and is proportional to the width of the interspace. If main ribs are close together, there is no intercalary riblet. Ears unequal, anterior triangular, radiately ribbed and with the byssal notch hardly developed. Posterior ear broken. Length 29.5 millim. Height 28.5 millim. Depth 5 millim.
Fossil occurrence.— Shigarami.» MATAJIRO YOKOYAMA, 1925
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