The book Text-Book of Zoology for Junior Students was written by author Nicholson Henry Alleyne Here you can read free online of Text-Book of Zoology for Junior Students book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Text-Book of Zoology for Junior Students a good or bad book?
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These tins maj' be sujiported by "sjiinous rays " or "soft I'ays," or by both. The spinous rays are simjile undivided bony spines which taper to a jmint. The .soft ravs are doulil^' divided, splitting up tfjwarils their extrenuties into a nundier of secondary rays, and being also divideil by transverse joints into mimerous short ]iieces. 4. Besides the "paired" lins whicli re] resent the limbs, there is Fig. 17-1. -Tl)i' Orirl {i;,i:hi!!vin,-rhmi-). also a series of iiiipiiinil or " meili.an " ...tins, the rays of which are supported upon a series of dagger-sh.ijied bones, dee]ily plunged in the Hesh in the middle line of the body, ami known as the " inter- spinous " bones (tig. Kio). The median fins (fig. 174) are variable in number, but when fully develojied they consist of one to three tins on the back (the dor.sal tins), one or two on the ventral surface (the anal hns), and oiu^ chithing the p(isterior extremity of the bod}' (the caudal tin, or tail). In all the 7'i'/rnsti'/\ the caudal fin has the shape c:dled " homocercal " — that is to say, it consists of two equal lobes — and the vertebi'al cobuun is not ]irolonged into the U])per lobe (tig.
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