Phylogeny of the Pelecypoda : the Aviculidae and their allies . illsof Lima differ from those of Pecten in that the separate filaments are joined by barswhich form a direct concrescence of the several filaments instead of by the interlockingof ciliated processes, as in Pecten; and in this character Lima agrees with Osti-ea. A young Lima elliptica, in the Jeffreys collection at the Smithsonian Institution, showsa well-marked prodissoconch. In a drawing which I made at that museum, PI. xxvir,fig. 6, the prodissoconch is sharply marked off from the succeeding dissoconch, and it In VecUn irrmlkois
Phylogeny of the Pelecypoda : the Aviculidae and their allies . illsof Lima differ from those of Pecten in that the separate filaments are joined by barswhich form a direct concrescence of the several filaments instead of by the interlockingof ciliated processes, as in Pecten; and in this character Lima agrees with Osti-ea. A young Lima elliptica, in the Jeffreys collection at the Smithsonian Institution, showsa well-marked prodissoconch. In a drawing which I made at that museum, PI. xxvir,fig. 6, the prodissoconch is sharply marked off from the succeeding dissoconch, and it In VecUn irrmlkois, tho tip of the reflected lilameiits Lacaze-Dulliicrs also observed sucli a Ijrief rcllectiori in is bent bacli on itself slightly, PI. xxiv, flg. 12, indicating the outer filaments of Anemia, the initial stages of such an abbreviated additional lamina. 354 ROBERT TRACY JACKSON ON THE has well-developed umbos. The succeeding dissoconch is limaform, btit no prismaticstructure was observed as in young Pectens; it may, however, exist in
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Keywords: ., bookcentury1800, bookdecade1890, bookidphylogenyofp, bookyear1890
