. Principles of economic zoo?logy. Zoology, Economic. TREMATODA CLASS 11. TREMATODA The class Tremato'da is comprised of worms either internally or externally parasitic. The body is usually thicker than that of the turbellarians. The form is usually leaf-like, though it is sometimes elon- gated. The anterior end is distinguished by the arrange- ment of suckers, and, in some of the external parasites, by Fig. 23.—The common liver-fiuke {Fasci'ola hepat'im) enlarged to show the anatomic characters: ac, Acetab- ulum ;c, p., cirrus pouch ;t, intestinal ceca; m, mouth with oral sucker; ov, o
. Principles of economic zoo?logy. Zoology, Economic. TREMATODA CLASS 11. TREMATODA The class Tremato'da is comprised of worms either internally or externally parasitic. The body is usually thicker than that of the turbellarians. The form is usually leaf-like, though it is sometimes elon- gated. The anterior end is distinguished by the arrange- ment of suckers, and, in some of the external parasites, by Fig. 23.—The common liver-fiuke {Fasci'ola hepat'im) enlarged to show the anatomic characters: ac, Acetab- ulum ;c, p., cirrus pouch ;t, intestinal ceca; m, mouth with oral sucker; ov, ovary; p. b., pharyngeal bulb; s. </., shell gland; t, profusely branched testicles; ul, uterus; pa, vagina; V. g., profusely branched vitellogene gland. (After Stiles, 1894, p. .300.). 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 Daugherty, Lewis Sylvester, 1857-; Daugherty, L. S. , Mrs. , 1859-. Philadelphia, London, W. B. Saunders
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