. An elementary course of practical zoology. Zoology. 34S THE CRAYFISH to hav(; th(j character of a hard, jointed armour. Tufts of minute feather-like cuticular structures, or seta, are present on various parts of the exoskeleton both of the body and appendages. It has been stated that the abdominal segments are movable upon one another in a vertical plane : , the whole DA. 0.\. ;al abdominal artery ; EM. ma^i:le> of the abdomen ; EP. space between the pleuron and the appendage ; FM. ventral muscles of the abdomen ; M. muscles of the appendage ; N. er\dopodite ; XG. nerve-g
. An elementary course of practical zoology. Zoology. 34S THE CRAYFISH to hav(; th(j character of a hard, jointed armour. Tufts of minute feather-like cuticular structures, or seta, are present on various parts of the exoskeleton both of the body and appendages. It has been stated that the abdominal segments are movable upon one another in a vertical plane : , the whole DA. 0.\. ;al abdominal artery ; EM. ma^i:le> of the abdomen ; EP. space between the pleuron and the appendage ; FM. ventral muscles of the abdomen ; M. muscles of the appendage ; N. er\dopodite ; XG. nerve-ganglion ; P. protopodite ; PL. pleuron ; PR. hind-gut ; S. sternum ; T. tergum ; V. ventral abdominal arter>" ; X. e.\opodite. (From Marshall and Hurst's Zoology'). abdomen can be extended or straightened, ds\<S. flexed or bent under the cephalothorax ; the segments are incapable of movement from side to side. This is due to the fact that, while adjacent segments are connected dorsally and ven- trally by flexible articular membranes, they present at each side a joint, placed at the junction of the tergum and. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Parker, William Newton, joint author. London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1900
