. A manual of elementary zoology . Zoology. MANUAL OF ELEMENTARY ZOOLOGY Gut, tines, which run on either side of the middle line to the hind end of the body, giving off on either side many offsets, which in turn are much branched. There is no anus. The worm feeds on the juices, probably normally on the blood, of its host. The so-called cuticle is a horny layer Wo& formed by the transfor- mation of the epidermis or ectoderm (Fig. 404). Below it lie successively circular, longitudinal, and diagonal layers of muscle fibres. Between these and the endoderm, which is a columnar epithelium lining
. A manual of elementary zoology . Zoology. MANUAL OF ELEMENTARY ZOOLOGY Gut, tines, which run on either side of the middle line to the hind end of the body, giving off on either side many offsets, which in turn are much branched. There is no anus. The worm feeds on the juices, probably normally on the blood, of its host. The so-called cuticle is a horny layer Wo& formed by the transfor- mation of the epidermis or ectoderm (Fig. 404). Below it lie successively circular, longitudinal, and diagonal layers of muscle fibres. Between these and the endoderm, which is a columnar epithelium lining the gut, lies the parenchyma, a meshwork of proto- plasm with nuclei at the nodes and oval cells in the meshes. Muscle fibres pass across the parenchyma from the dorsal to the ventral side of the body. There are no blood vessels or ccelom. It will be noticed that in the fluke a mass of tissue lies between the ecto- derm and endoderm in. Fig. 122. —The structure of a liver fluke. —After Sommer. From the ventral surface. The branched gut (g.) and place of the Structure- the lateral nerve () are shown to the left of the figure, the branches of the excretory vessel () to the right. , Position of cirrus sac; g:, lateral head ganfilion ; w., month ; ph., pharynx ; , ventral sucker. An arrow indicates the excretory aperture, less lamella of Hydra. This is known as the mesoderm. We shall allude to it in more detail in describing the 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 Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder & Stoughton
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
