The book A Junior Course of Practical Zoology was written by author A Milnes Arthur Milnes Marshall Here you can read free online of A Junior Course of Practical Zoology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Junior Course of Practical Zoology a good or bad book?
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238). The inner surface of the ring is lined by a layer of bone. The notochord persists throughout the whole length of the column: it is greatly constricted opposite the middle of each vertebra, but thickened almost to the full width of the column in the inter- vertebral spaces. 2. The heemal arches. In the anterior part of the vertebral column the centra are flattened ventrally, and produced laterally into blunt horizontal transverse processes, which bear at their ends movably articulated cart...ilaginous ribs about half an inch in length. Further back the transverse processes become more prominent and project ventrally as haemal processes, causing the under surface of the column to appear grooved. In the tail the ribs are absent, and the hiemal processes of each vertebra meet and . unite mid- ventrally, thereby completing the hfemal arch, which encloses the caudal artery and vein. At the hinder end of the tail, opposite the caudal fins, the haemal arches are produced downwards into median hsemal spines.
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