. A manual of zoology. Zoology. Fig. 217. Fig. Fig. 217.—Distomtim hepaticum^ liver fluke (from Boas), vi, caeca of /a, limbs of digestive tract; s^s^, anterior and posterior suckers. Fig. 218.—Distomum lanceolatum. c, cirrus, beneath it the opening of the o\dduct; d vitellaria, the ducts leading to the shell gland; g, ganglion; h, testes with ducts to cirrus; / Laurer's canal; 0, ovarj', the shell gland behind it; s', s", anterior and median suckers, the pharjmx and the bifurcated digestive tract leading from s'; u, uterus; w, terminal vesicle of water-vascular (excretory) system. To par
. A manual of zoology. Zoology. Fig. 217. Fig. Fig. 217.—Distomtim hepaticum^ liver fluke (from Boas), vi, caeca of /a, limbs of digestive tract; s^s^, anterior and posterior suckers. Fig. 218.—Distomum lanceolatum. c, cirrus, beneath it the opening of the o\dduct; d vitellaria, the ducts leading to the shell gland; g, ganglion; h, testes with ducts to cirrus; / Laurer's canal; 0, ovarj', the shell gland behind it; s', s", anterior and median suckers, the pharjmx and the bifurcated digestive tract leading from s'; u, uterus; w, terminal vesicle of water-vascular (excretory) system. To parasitism may also be attributed the great development of the sexual organs, which at maturity fill a great part of the body. Their features may be seen in fig. 218. Two vasa deferentia pass forward from the testes {h), unite and form a seminal vesicle. The terminal portion of the united ducts can be protruded as a penis or cirrus (c) armed with retrorse hooks. It is usually enclosed in a 'cirrus pouch.' The unpaired ovary (0) is very small and pro- duces small eggs, deficient in yolk; hence the paired vitellaria (d) are well developed. The united ducts from these join the oviduct, producing the uterus (u), which receives the eggs, is much convoluted, and empties beside (in some. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
