Title: Animal biology
Identifier: animalbiology00wolc (find matches)
Year: 1933 (1930s)
Authors: Wolcott, Robert Henry, 1868-1934
Subjects: Zoology; Biology
Publisher: New York ; London : McGraw-Hill Book Company, Inc.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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166 METAZOAN PHYLA (Fig. 76), a fluke which h-ves as an adult in the bile ducts of the Hver of man, dog, and cat, and is found in China and Japan. In addition to the firm leathery cuticle, the absence of ciha, and the presence of suckers, all of which represent adaptations to a parasitic mode of existence, this form in its adult condition is to be contrasted with a planarian in the absence of eyespots and in the more highly developed reproductive system. The single excretory pore lies at the extreme posterior end of -Oral sucker -P/iaryrJx -Merye center Gen/ta/ pore Excrefory. 5emjr7a/ receptarc/e Laurer's Testes
Text Appearing After Image:
Erjterort Van trof/ sucker" Yolk gr/air)fifS - Vas deferens Uterus —Yolk of act Ovary Vas effererjs fxcretory pore Fig. 76.—Clonorchis sinensis Cobbold. (Rcdraum from Hegnrr, Root and Augvstine, ^'Animal Parasitology, after Faust.) Dorsal view, showing internal structure. X 8. the body. Added to the female organs is a shell gland which secretes a substance that hardens the shells of the eggs (Fig. 77). 194. Cestoda.—This class includes the tapeworms, which are most common in the alimentary canals of vertebrates. A typical tapeworm (Fig. 78) consists of a more or less rounded head, or scolex, and a relatively slender neck, which together form one section of the body, and a number of other sections called proglottids. The scolex bears suckers and is projected at its free end into a rostellum which may have an encircling

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