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1.
Spat
Oyster spats at different short intervals after fixation.... The larval shell (prodissoconch) maintains the same size as long as it can be recognized in a spat. Larval shells of all spats maintain approximately the same size, no matter how large the spats grow. In all the figures the prodissoconch is shaded, the dissoconch only outlined. The spats soon become so large that a lower power objective has to be used in order to see the whole spat at once.
2.
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)
3.
Scallops: Changes in form of shell. A series of drawings illustrating the changes from the early veliger (the first shell), which is 1/10 of a millimeter in size, to a 2-millimeter scallop. Note (a) change from flat-hinged veliger (1) to the prodissoconch (2), with prominent umbones; (b) return to a straight hinge (3), witdth greater than height; (c) width and height become equal (8); (d) formation of 'ears' (10)
4.
Scallops: Changes in form of shell. A series of drawings illustrating the changes from the early veliger (the first shell), which is 1/10 of a millimeter in size, to a 2-millimeter scallop. Note (a) change from flat-hinged veliger (1) to the prodissoconch
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