. A text-book of agricultural zoology. Zoology, Economic. ACAEINA OR MITES. 119 minute embryo bores through the intestines and gets to the liver, lungs, and mesenteric glands, where encystment takes place. It here soon becomes converted into a simple roUed-up pupa (c), with no legs, hooks, or bristles. By a repeated series of moults a second larval form is reached (d), and which is said to last for seven months, by which time it has grown to the length of one- third of an inch. In this stage it was taken to be a distinct species called L. denticulatum. Numerous spiny rows are. Fia. 4S.—LlNUUAT
. A text-book of agricultural zoology. Zoology, Economic. ACAEINA OR MITES. 119 minute embryo bores through the intestines and gets to the liver, lungs, and mesenteric glands, where encystment takes place. It here soon becomes converted into a simple roUed-up pupa (c), with no legs, hooks, or bristles. By a repeated series of moults a second larval form is reached (d), and which is said to last for seven months, by which time it has grown to the length of one- third of an inch. In this stage it was taken to be a distinct species called L. denticulatum. Numerous spiny rows are. Fia. 4S.—LlNUUATDLID^. A, Ovum. B, larva, c, pupal stage: a, anus; &, mouth. D, Linguatula denticula- tum. E, L. tseniodes. (Alter Eailliet and Leuokart.) present on the skin. They fall from the organs they were in, to the body cavity and pleural spaces, and the majority die. Some, however, encyst themselves in fresh parts of their host, and even enter the air-tubes, and are so passed out of the host; or they may possibly enter the nasal cavities of the herbivora they live in, during their early life. More generally they reach maturity in the nasal cavities of the carnivora which happen to eat the flesh of infected herbivorous animals. In this last host. 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
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
