. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 350 THE MITES man. In the course of five or six months the larvae (Fig. 146C), having migrated to the liver or lymph glands, transform to the second larval stage (Fig. 146E), reach a length of about one-. FiG. 147. Head of a. dog split in half to show three tongue-worms, Linguatula rhinaria, (a) in the nasal cavity. Reduced in size. (After Colin, from Hall.) fourth of an inch, and consist of from 80 to 90 rings or segments, each one with very fine denticulations on the hind margin. For a long time this
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 350 THE MITES man. In the course of five or six months the larvae (Fig. 146C), having migrated to the liver or lymph glands, transform to the second larval stage (Fig. 146E), reach a length of about one-. FiG. 147. Head of a. dog split in half to show three tongue-worms, Linguatula rhinaria, (a) in the nasal cavity. Reduced in size. (After Colin, from Hall.) fourth of an inch, and consist of from 80 to 90 rings or segments, each one with very fine denticulations on the hind margin. For a long time this larva was looked upon as a distinct species. L. rhinaria is nowhere abundant, even in its normal hosts, though in some parts of Europe about ten per cent of dogs are said to be infected. The majority of human cases reported have been in Germany. Another species which is occasion- ally found as a parasite in man dur- ing its larval stage is Porocephalus armillatus (Fig. 148). Unlike Lingua- tula, this worm has a cyhndrical body, only about 18 to 22 rings of segments and a total length of about one-half an inch. The segments have no fine denticulations as they have in Lingua- tula. This species is said to spend its adult life in the lungs of the African python, the larvae occurring occasionally in man, but more frequently in giraffes, monkeys and other African animals. Sambon thinks the eggs escape from 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 Chandler, Asa Crawford, 1891-. New York, J. Wiley
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