Phylogeny of the Pelecypoda : the Aviculidae and their allies . Fio. 44. Fig. 45. FIG. 46. Fig. Fig. 48. Fig. 49. Fig. 44.— Unio cai-iosus, glochidium from tlie gills of the parent. FiCr. 45.—Margaritana undulata. glochidium from the gills of the parent. Fig. 46.—Anodon cygnea, glochidium from the gills of the parent. Fig. il.—Anodon fliiviatilis, glochidium from the gills of ths parent. Fig. 48.—Margaritana undulata, umljonal tip of a young shell, showing the prodissoconch, p, still in place and thencpionlc stages of tlie succeeding dissoconeh. Fig. 49.—Anodon flumatilis, uraboual tip of
Phylogeny of the Pelecypoda : the Aviculidae and their allies . Fio. 44. Fig. 45. FIG. 46. Fig. Fig. 48. Fig. 49. Fig. 44.— Unio cai-iosus, glochidium from tlie gills of the parent. FiCr. 45.—Margaritana undulata. glochidium from the gills of the parent. Fig. 46.—Anodon cygnea, glochidium from the gills of the parent. Fig. il.—Anodon fliiviatilis, glochidium from the gills of ths parent. Fig. 48.—Margaritana undulata, umljonal tip of a young shell, showing the prodissoconch, p, still in place and thencpionlc stages of tlie succeeding dissoconeh. Fig. 49.—Anodon flumatilis, uraboual tip of a young shell showing the prodissoconch, p, still in place and the nepionicstages of the succeeding dissoconeh. All the figures (except fig. 4f;) are of left valves. The arrows are directed toward th3 anterior end of the shell; s, glo-chidial spurs; A, hinge. All the figures X .50 diam. (Drawu Ijy th3 author.) In Anodon the glochidium is better known than the same stage of other genera of thisfamily, as it has been more often studied by embryologists. Schmidt studied it during thepe
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Keywords: ., bookcentury1800, bookdecade1890, bookidphylogenyofp, bookyear1890
