. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 288 Annals of the Carnegie Museum. tube; the latter forms the ovisac, containing the eggs and embryos, and this ovisac is also closed at the base of the marsupium by a fine The eggs and glochidia fill the ovisacs without forming placentae, and the glochidia are discharged through the anal opening in rather irregular masses. Glochidia27 rather large, triangular, with hooks. They are about as long as high, mm. (see Plate XIX, fig. 2). Having seen only alcoholic material I refra
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 288 Annals of the Carnegie Museum. tube; the latter forms the ovisac, containing the eggs and embryos, and this ovisac is also closed at the base of the marsupium by a fine The eggs and glochidia fill the ovisacs without forming placentae, and the glochidia are discharged through the anal opening in rather irregular masses. Glochidia27 rather large, triangular, with hooks. They are about as long as high, mm. (see Plate XIX, fig. 2). Having seen only alcoholic material I refrain from describing the colors of the soft parts. Anodonta complanata Rossmaessler. See also Ortmann, 1911c, p. 22. Six specimens from Dinkelsbuehl, Bavaria, and ten specimens from Buda-Pest, Hungary, are at hand, received from W. Israel. Among them are gravid Fig. 14. Anodonta complanata Rossrruessler. Male, from Wcernitz River, Dinkelsbiihl, Bavaria. (Cam. Mus., No. 61, 4,958-) Inner edge of anal opening with very fine papillae. Gills (see Plate XVIII, fig. 9) essentially of the same structure as Anodonta cygnea, -' That the lateral water-tubes are actually parts cut off from the original water- tube by folds is conclusively shown by fig. 8, Plate XVIII. This is a slide made from a female, in which the eggs were just beginning to go into the marsupium. Attention should be called to the fact that in this species I never found the lateral water-tubes complete. This may be due to the fact that all my material was col- lected early in the breeding season. Nevertheless, some of the specimens had fully developed glochidia. 27 The glochidia have been figured by Fleming (1875, pi. 4, fig. 4) and Schierholz (1889, pi. 2, fig. 26), their measurements, mm., have been given by Harms (1909, p. 332) and Haas (1910a, p. no).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of
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