. A text-book of invertebrate morphology. Invertebrates. 178 INVEBTEBBATE MORPHOLOGY. tive tissue beneath the skin, producing ulcers, at the bottom of which the worm lies coiled up. The ova develop in water and the embryos pass probably into small Crustacea, which are swallowed with drinking-water. Filaria sanguinis hoininis, also solely trppical in its distribution, receives its name from the fact that it lays its ova in the blood of man, which may thus swarm with countless numbers of small worms. These make their way to the exterior of the body by the kidneys, producing haemorrhages or minut
. A text-book of invertebrate morphology. Invertebrates. 178 INVEBTEBBATE MORPHOLOGY. tive tissue beneath the skin, producing ulcers, at the bottom of which the worm lies coiled up. The ova develop in water and the embryos pass probably into small Crustacea, which are swallowed with drinking-water. Filaria sanguinis hoininis, also solely trppical in its distribution, receives its name from the fact that it lays its ova in the blood of man, which may thus swarm with countless numbers of small worms. These make their way to the exterior of the body by the kidneys, producing haemorrhages or minute abscesses in that organ and, as the result of these, milky or bloody urine. 2. Order Gordiacea. This order includes the families of the Gordiidce and Mer- mithidoe, long slender thread-like worms, which differ from the Eunematoda in several important respects. They occur in their mature state in fresh water; in their immature stages, howeyer, they are parasitic in insects. In the adult Gordius the mouth is usually closed by an overgrowth of the cuticle, and the anus is lacking in Mermis. The musculature of the body-wall consists only of longitudinal fibres (Fig. 89, m), which. d Fig. 89. —Teansvehsb Section op Oordius (after Vejdovskt). cu = cuticle. n = nerve-cord. d = Intestine. pe = peritoneum. hy = hypodermis. 'ut = uterus. m = lougitudinal muscles. ov = oviduct. differ in their arrangement from those of the Eunematoda in being interrupted only in the mid-ventral line. The coelom is lined by a peritoneal epithelium (pe) lying beneath 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 McMurrich, J. Playfair (James Playfair), 1859-1939. New York, H. Holt and Company
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