. A manual of zoology. PHYLUM CHORDATA 329 Not only must entire and, if convenient, living speci- mens be examined, but prepared skeletons of all three must be availa- ble for examination, and preparations showing the various systems of inter- nal organs, notably the di- gestive system, the heart, and the brain. An external comparison appears at first sight to reveal few points of agree- ment between the three selected examples. The skin, the general shape, the movements, are all widely different. A few features common to all three are, however, to be recognised. It will be observed that in al
. A manual of zoology. PHYLUM CHORDATA 329 Not only must entire and, if convenient, living speci- mens be examined, but prepared skeletons of all three must be availa- ble for examination, and preparations showing the various systems of inter- nal organs, notably the di- gestive system, the heart, and the brain. An external comparison appears at first sight to reveal few points of agree- ment between the three selected examples. The skin, the general shape, the movements, are all widely different. A few features common to all three are, however, to be recognised. It will be observed that in all three are distinguishable a head region, in front, a trunk region (by far the largest), in the middle, and a tail region, differing greatly in its development, behind. The head region bears anteriorly the opening of the mouth, bounded above and below by jaws. 3S = S -S S E7 mS-5 > !r:fs 6. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1900
