. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 196 ZOOLOGY The economic importance of parasitic worms is very great. Thus, although no great e]3iclemics of the flukes have occurred in this country, a million shee]5 are annually lost by this para- site in Great Britain; and in 1879 and 1880 it was estimated that three million sheep died annually in England alone of. - Development of Distomum porocyst eon- taining developing rcdiae ; C, redis, containing a daughter redise and embrj'O liver-flukes; D. tree-swimming, tailed lar\-a of liver-fluke ; 6. op, bi
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 196 ZOOLOGY The economic importance of parasitic worms is very great. Thus, although no great e]3iclemics of the flukes have occurred in this country, a million shee]5 are annually lost by this para- site in Great Britain; and in 1879 and 1880 it was estimated that three million sheep died annually in England alone of. - Development of Distomum porocyst eon- taining developing rcdiae ; C, redis, containing a daughter redise and embrj'O liver-flukes; D. tree-swimming, tailed lar\-a of liver-fluke ; 6. op, birth opening ; cnt, food canal of rcdia ; eye. eyespots ; gust, young redia : fjerm, inor. early stages in formation of the embr>'o livei-fluke : int. intestine of larval liver-fluke : ii:x. resophagus ; m. xii. oral sucker: yiop. head papilla of ciliated larva, A ; ]>h. pharnj-x ; pruc, ijroccsscs of redia ; vttd. su, ventral sucker. After Thomas. this parasite. In Bumios Ayres, during 1882, a million sheep died of fluke disease. By great care in preventing infection, especially during dami^ seasons, we may be able to prevent any such disaster in this 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 Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
