. Bulletin - United States National Museum. Science. Carinal margin Basal margin. Articular furrow Fig. 4.—External and internal views of tergum. Darwin and others have compared this structure with that of the pedunculate genus, Pollicipes (MiteUa). A nearer likeness, perhaps, exists with ScyUselepas, in which there has been further specialization of the plates. Brachylepas, though superficially like Catophragmus, is evidently not in the line of descent of the Balanomorpha. On account of the different system of imbrication of the plates, it does not seem likely that the Bala/nomorpha descended

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. Bulletin - United States National Museum. Science. Carinal margin Basal margin. Articular furrow Fig. 4.—External and internal views of tergum. Darwin and others have compared this structure with that of the pedunculate genus, Pollicipes (MiteUa). A nearer likeness, perhaps, exists with ScyUselepas, in which there has been further specialization of the plates. Brachylepas, though superficially like Catophragmus, is evidently not in the line of descent of the Balanomorpha. On account of the different system of imbrication of the plates, it does not seem likely that the Bala/nomorpha descended from Mesozoic ScyUselepas, but rather that both had a common ancestor. 4729°—Bull. 93—16 2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.

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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience