The book An Introduction to Zoology was written by author Charles Henry Odonoghue Here you can read free online of An Introduction to Zoology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is An Introduction to Zoology a good or bad book?
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The base of the papilla 214 AN INTRODUCTION TO ZOOLOGY narrows off considerably, but always remains open, and the whole structure sinks down into the dermis, below the level of the epi- dermis, causing the enamel epithelium and the adjacent cells of the Malpighian layer to become infolded in a very characterictic manner. The main part of the papilla remains to form the pulp, which with the odontoblasts and dentine of the blade and entire basal plate, by far the largest part of the denticle, is ...the product of the dermis. The enamel alone, at any rate the greater part of it, comes from the epidermis, and, according to some authorities, this also receives contributions from the underlying dentine. The second variety of exoskeletal element in the dogfish takes the form of fairly long cartilaginous rods or rays supporting the distal parts of all the fins. In consequence of their being developed in the dermis they are termed dermal fin rays or dermotrichia. Muscular System. The muscles of the dogfish, like those of the frog, are pf two varieties, striate and non-striate.
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