Pecten permirus var. paucicosta Yokoyama, 1926
YOKOYAMA, M. 1926. On some Pliocene shells from Kaga and Noto. Journal of the Geological Society of Tokyo, 33 (391): 9-11, pl. 1. [p. 10, pl. 1, fig. 2]
«The left valve shown in fig. 2 has only fifteeen regular ribs. It is probably an abnormal form; but as we possess at present no intermediate ones connecting it with the typical, I provisionally separate it as var. paucicostata. It is 80 millim. high, 82 millim. Iong and 13 millim. deep.»
MATAJIRO YOKOYAMA, 1926
|