Pecten (Chlamys) multirugosus var. crassiplicatus Gale, 1928
GALE, H. R. 1928. West Coast species of Hinnites. Transactions of San Diego Society of Natural History, 5 (9): 91-94. [p. 93]
«Pecten (Chlamys) multirugosus var. crassiplicatus, new name
Hinnites crassa Conrad, Reports U.S. Pacific Railroad Explorations and Surveys, Vol. 7, pt. 2, p. 190, pl. 2, figs. 1, 2, 1857, description reprinted by Dall, Professional Paper 59, U.S. Geological Survey, p. 181, 1909; etc., not Pecten crassus A. Risso, Histoire naturelle des principales productions de l'Europe meridionale. Vol. 4, p. 300, November, 1826.
"Pecten (Hinnites) gigantens Gray," Arnold, Professional Paper 47, U.S. Geological Survey, pl. 29, fig. 1 only, 1906. The type is No. 13336 of the United States National Museum. It is figured by both Conrad and Arnold.
The form described by Conrad from the Miocene has the raised ribs of the left valve more strongly accentuated, sometimes even in the pectinidial stage, than is normal for the later fossil and living specimens; and the intercalates become accentuated later in the growth of the individual and are not so pronounced. The effect is that of about ten stronger, irregular ridges standing out above the three or four minor intercalates, whereas in the Pliocene and living forms the first set of intercalaries is accentuated early, becoming nearly equal in size to the original, and giving the appearance of twenty or more less prominent irregular ridges standing out only slightly above the three or four minor intercalaries between each pair of them. Thus the variety crassiplicatus has a smaller number of more highly differentiated coarse rugose ridges. It also is apt to be smaller in size and to have a smaller amount of irregular growth.» HOYT RODNEY GALE, 1928
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