. Handbook of zoology [microform] : with examples from Canadian species, recent and fossil :. Zoology; Invertebrates; Zoologie; Invertébrés. rUOVINCE AKTICULATA. 181 is not tlio case in the previous group. The common round worms of the human intestines (^Ascaris) belong to this order. A still more dangerous though microscopic parasite is the Trichina spira- lis (Fig. 219), which inhabits the muscles of the Fif/.m. If. in an 1 which Trichina simualis, in its cyst, mogniHod; and specimen removed from itB cyst, larther niagnilicd. domestic hog, and when transferred from these to the human stomach
. Handbook of zoology [microform] : with examples from Canadian species, recent and fossil :. Zoology; Invertebrates; Zoologie; Invertébrés. rUOVINCE AKTICULATA. 181 is not tlio case in the previous group. The common round worms of the human intestines (^Ascaris) belong to this order. A still more dangerous though microscopic parasite is the Trichina spira- lis (Fig. 219), which inhabits the muscles of the Fif/.m. If. in an 1 which Trichina simualis, in its cyst, mogniHod; and specimen removed from itB cyst, larther niagnilicd. domestic hog, and when transferred from these to the human stomach, multiplies rapidly,and penetrates the tissues, causing great and sometimes fatal irri- tation. It finally forms a sac or cyst, in which it remains in a quiescent condition, unless transferred into the alimentary canal of some new host, where the same course is again pursued. Another curious Avorm belonging to this group, is the hair-worm (^Gordlu&.^ These creatures are internal parasites in the larger aquatic insects, from which, when mature, they come forth as ex- tremely long and slender worms, of a whitish or brown colour, which swim "rcely in the water of pools and there deposit their eggs. From their sudden appearance in great numbers in such places, arises the popular superstition that they are ani- mated hairs. Our common species is probably G, facustris, 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 Dawson, J. W. (John William), Sir, 1820-1899. Montreal : Dawson
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
