Identifier: externalinternal00verr (
find matches)Title:
The external and internal parasites of (man and) domestic animalsYear:
1870 (
1870s)Authors:
Verrill, A. E. (Addison Emery), 1839-1926Subjects:
Medical parasitology Domestic animals ParasitesPublisher:
(Hartford, Conn., Case, Lockwood & Brainard, printers)Contributing Library:
Smithsonian LibrariesDigitizing Sponsor:
Biodiversity Heritage LibraryView Book Page:
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view book online to see this illustration in context in a browseable online version of this book.Text Appearing Before Image:s-like top, around which there are two cir-cles of sharp hooks, 22 to 28 in each circle (Figure 53).The neck portion is slender, crossed by fine lines, which arewider apart as they recede from the head, finally forming dis- 70 BOARD OP AGEICULTURE. tinct joints. These are at first very small and short, graduallybecoming broader and squarish, then oblong. The largestare about a third of an inch in breadth and quite thin and flat(Figure 52). The sexually mature joints or proglottides aretwice as long as broad, and contain the ovaries and a longcentral egg cavity or uterus, with 7 to 12 lateral branches,which are irregularly lobed and divided (Figure 54.) ; and alsothe male organ, or testicle, in the form of branched tubes,communicating with a penis, which is situated on one edgeof the joint, in front of the female genital orifice, and has acurved or sickle-shaped form. The genital openings are eitheron the right or left edge indifferently, in the successive joints. Figure 49. Figure 52.Text Appearing After Image:The young or larval state produces the white spots known as Figure 49.—Pork measles ; natural size; Hearth and Home, after Ovv-en; Figure 50.—Young tapeworm from measles of pork; and Fig. 51, head of same,more enlarged; Hearth and Home, after Owen. Figure 52.—Pork tape-worm (Tccnia soHum). less than natural size; Hearth andHome, after Owen. PARASITES OF ANIMALS. 71 , measles in pork (Figure 49). These are cavities or cystsproduced by inflammation, containing whitish fluid and enclos-ing small, bladder-like, translucent, vesicles, filled with a wateryfluid, and which contain the proper head and neck of the youngworm coiled up spirally in the interior in an inverted position.By gentle pressure the head and neck may be made to protrudeby inversion, like the finger of a glove, and will then presentthe appearance shown in figure 50, the vesicle of fluid nowforming the flask-like caudal portion of the worm. The headmay now be seen to have four suckers and a central promi-nence surrounNote About Images 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 work.