. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Ortmann: Families vnd Genera oi Najades. 287 Supra-anal and anal openings widely separated, the one about as long as the other, but the united \><i\\ of the margin of the mantle sa. Fk;. 13. Anodonta cygnea (Linnaeus). Male, from Obra South Canal, Sepno, Prov. Posen, Germany. (Cam. Mus., No. 61, 4,956.) mp between them longer than either, with slight variations in length. Anal with crenulations, branchial with papillae. Palpi with the pos- terior margins united for one- fourth or one-th
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Ortmann: Families vnd Genera oi Najades. 287 Supra-anal and anal openings widely separated, the one about as long as the other, but the united \><i\\ of the margin of the mantle sa. Fk;. 13. Anodonta cygnea (Linnaeus). Male, from Obra South Canal, Sepno, Prov. Posen, Germany. (Cam. Mus., No. 61, 4,956.) mp between them longer than either, with slight variations in length. Anal with crenulations, branchial with papillae. Palpi with the pos- terior margins united for one- fourth or one-third of their length. Gills and diaphragm as usual, inner lamina of inner gills free, except at anterior end. In the male, the septa of both gills are rather distant; in the sterile female the septa of the outer gill are very crowded, forming very narrow water-tubes (see Plate XVIII, fig. 7). The whole outer gill is marsupial, and at its edge there is heavy tissue which permits the distending of the gill when charged. Within the marsupium each water-tube is divided, in the breeding season, into three tubes, two narrow lateral (secondary) water-tubes lying toward the faces of the gill, and a central larger. 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 Carnegie Museum; Carnegie Museum of Natural History. [Pittsburgh] : Published by authority of the Board of Trustees of the Carnegie Institute
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
