. A text-book of agricultural zoology. Zoology, Economic. THE LITEK-FLUKE. 37 small prickles, directed backwards, which one can easily feel on pulling the worm through the fingers from tail to head. The oral sucker is terminal, small, and round : the ventral sucker is towards the anterior end, large and round, with a triangular ^ ' opening. The intestine can be seen through the integument as two dark Tk-~ forked branches. The ova, which may *" often be seen in the uterus, are ovoid bodies of a dark-brown colour. Lambs are especially affected. The ... Fig. 7.âLivee-fldke same species is lo
. A text-book of agricultural zoology. Zoology, Economic. THE LITEK-FLUKE. 37 small prickles, directed backwards, which one can easily feel on pulling the worm through the fingers from tail to head. The oral sucker is terminal, small, and round : the ventral sucker is towards the anterior end, large and round, with a triangular ^ ' opening. The intestine can be seen through the integument as two dark Tk-~ forked branches. The ova, which may *" often be seen in the uterus, are ovoid bodies of a dark-brown colour. Lambs are especially affected. The ... Fig. 7.âLivee-fldke same species is lound m goats, cattle, {Distomumhepatimm). camels, the horse, pig, rabbit, and man. ., "â oâ¢i sucker; gp, gen- . ' 1. ai 7 italpore; ii, ventral sucker; They live chiefly in the biliary ducts of P^, pharynx; a, alimentary CftUElI.* the liver. Damp wet seasons and damp ground favour the spread of distomatosis. Melds liable to be flooded along the course of rivers are often certain to cause sheep to be infested with Fluke, the cysts being spread over the grass when the floods are out, and afterwards taken in by the lambs. Life-history.âThe life-history of this species has been deter- mined by Leuckart and Thomas. The ova pass out from the bile-ducts through the intestine to the ground in the excreta. Each ovum is provided with a lid, which breaks offj and the em- bryo is Incubation takes place in the summer, and occupies from three to six weeks. The embryo is covered with fine hairs^^ciliaâand is known as the ciliated embryo (fig. 8, a). It is lanceolate in form, broadened in front, and provided with a curious boring apparatus at the anterior end. It is necessary that this embryo should meet with its first host within twenty- four to thirty hours after it has hatched. Should it not do so it dies. Its first host is one of the water-snails (lAmiWBUs) that we see in such abundance along the sides of streams, runnels, and dykes. If the embryo comes in contact wit
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
