. Zoology : for students and general readers . Zoology. 160 ZOOLOGY. This worm is extremely rare in America, but is common in Western Switzerland and Central Europe, and in the north- western and northern provinces of Eussia, Sweden, and Poland. It is sometimes twenty-five feet long, and nearly an inch broad, with 4000 joints. The club-shaped head is unarmed, and the first sexually mature segment is about. Fig. 109.—Male reproductive organs, with partaof tlie female of Bothriocephalm latus. ty testicular follicles, only a part are represented ; ve, their excretory ducts; vd^ vas deferens ; c,
. Zoology : for students and general readers . Zoology. 160 ZOOLOGY. This worm is extremely rare in America, but is common in Western Switzerland and Central Europe, and in the north- western and northern provinces of Eussia, Sweden, and Poland. It is sometimes twenty-five feet long, and nearly an inch broad, with 4000 joints. The club-shaped head is unarmed, and the first sexually mature segment is about. Fig. 109.—Male reproductive organs, with partaof tlie female of Bothriocephalm latus. ty testicular follicles, only a part are represented ; ve, their excretory ducts; vd^ vas deferens ; c, cirrus ; cb, sac containing the cirrus ; w, uterus containing: eggs : ov, ovary ; gl, shell-gland ; e, water-vasciilar trunks ; y, vaginal and Somrner ; from Gegenhaur. the 600th from the head. Leuckart has suggested that the young of this tape-worm originate in salmon and trout. The sheep-hydatid is the larva of Tcenia canurus (Figs. 110 and 111), the adult infesting the dog. The presence of one or several of the hydatids in the brain of the sheep pro- duces the " staggers " or vertigo. The vesicle varies in size from a pea to a pigeon's egg. It is bladder-like, filled with a clear pale yellow albuminous secretion, with a great num- ber of retractile papillae {D, g), which are the tape-worm heads connected by narrow stalks to the common vesicles support-. 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
