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1.
Scallops: Early plicated stage. View of the right or lower valve. Note the smooth prodissoconch (pd) and siccoconch (d) areas, with the beginning of the sixteen plications (pl) of the adult. There are four teeth (te) on the byssal notch. (33); Scallop...viewed from left or upper valve (34); View of the anatomy of a slightly older scallop...as seen through the right valve. Note primary, secondary and tertiary eyes (e) and tentacles (t). The outer gill (og) has about twenty-five filaments, and begins to resemble the inner gill (ig) (35); View of right or lower valve of same scallop.... Note the five teeth (te) on the byssal notch (bn) and the beginning of the "ears (er). the two teeth back of the external border of the byssal groove are older, and have rounded rather than the pointed ends of the last formed teeth. The valves have become nearly equal, the hinge line straight, and the byssal groove (bg) can be traced back to the asymmetrical prodissoconch (36); View of upper left.... (37)
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