. A text-book of agricultural zoology. Zoology, Agricultural; Zoology, Economic. STRONGYLID^ OR PALISADE-WOKMS. 63 enters the large posterior arteries, especially one known as the " anterior mesenteric artery," where it produces a swelling in the wall of the artery (fig. 21). This growth checks the cir- culation, and may lead to vascular disturbances of some im- portance. Whilst in this abode the worm is immature; but just before maturity is reached the worm escapes, makee its way through the gut wall, matures, and copulates. The ova are carried out in tlie dung. The embryos are seen
. A text-book of agricultural zoology. Zoology, Agricultural; Zoology, Economic. STRONGYLID^ OR PALISADE-WOKMS. 63 enters the large posterior arteries, especially one known as the " anterior mesenteric artery," where it produces a swelling in the wall of the artery (fig. 21). This growth checks the cir- culation, and may lead to vascular disturbances of some im- portance. Whilst in this abode the worm is immature; but just before maturity is reached the worm escapes, makee its way through the gut wall, matures, and copulates. The ova are carried out in tlie dung. The embryos are seen to develop in. FiQ. 20.—Armed PAusArr-woRM of Horse (SderostoTmtm arTiiatum). Female. a, Male bursa. 1 damp mud and in water, and are thus taken by the horse. Another form, the Giant Palisade-worm (S. gigas), is a red worm nearly a foot in length in the female, and lives in the pelvis of the kidney in both horse and man. Sometimes severe epizootics of these Palisade-worms break out. Sderodomum tetracarifhum (fig. 22) and <S'. rubrum (fig. 23) are usually the most injurious Strongyles in the horse. The for- ' The female is often as big again as the line representing the natural size in the 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 Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and Sons
Size: 1950px × 1281px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
