. Elementary text-book of zoology. 148 PLA T YHELMINTHES. with the muscular movements of the host, the embryo is worked into the blood-vessels of the pig, along which it is carried into the muscles. Here it loses its hooks and be- comes a hollow vesicle or cyst. The wall of the oval cyst is invaginated at one side and forms a pocket. On the wall of the pocket are found suckers and hooks, and it is later evaginated to form the cestoid worm. Pork containing such cysts is known as "; This is known as the cystic stage or bladder-worm, and the cysts of Tcenia solium were known Fig.
. Elementary text-book of zoology. 148 PLA T YHELMINTHES. with the muscular movements of the host, the embryo is worked into the blood-vessels of the pig, along which it is carried into the muscles. Here it loses its hooks and be- comes a hollow vesicle or cyst. The wall of the oval cyst is invaginated at one side and forms a pocket. On the wall of the pocket are found suckers and hooks, and it is later evaginated to form the cestoid worm. Pork containing such cysts is known as "; This is known as the cystic stage or bladder-worm, and the cysts of Tcenia solium were known Fig. 84.—"Measly" The oval bodies are cysts. by the separate name of Cysticercus celluloses before their true nature was determined. The completed bladder-worm shows a large bladder, depending from which is the " body " of the worm. On being introduced, still alive, into the human subject the bladder, and with it the greater part of the body, is lost, and the head alone survives as a creeping worm, fixes itself and grows into the tapeworm. We may note that there is no true metagenesis, since the fission into proglottides can hardly be regarded as a method. 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 Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1902
