The Origin of Vertebrates
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In our eReader you can find the full English version of the book. Read The Origin of Vertebrates Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Origin of Vertebrates
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But in the nose, as in all other parts of the head-region of the lamprey, remarkable changes take place at transformation, and examination of the same tube in Ammocoetes demonstrates that the elaborate structure of the adult olfactory organ is actually derived from a much simpler form of organ, represented in Fig. 99. Here, in Ammocoetes, the section is no longer strikingly different from that of the Thelyphonus organ, but, instead, most strikingly similar to it.
Thus, again, it is shown that t...his larval form of the lamprey gives -cart Fig. 99. — Tbansvbbsb Section thbodgh the Olfactory Passage of Ammoccetes.
cart., nasal cartilage.
more valuable information as to vertebrate ancestry than all the rest of the vertebrates put together.
Still, even now the similarity between the two organs is not complete, for the tube in the lamprey opens on to the exterior on the dorsal surface of the head, while in the scorpion tribe it is situated ventrally, being the passage to the mouth and alimentary canal.
What to read after The Origin of Vertebrates?
You can find similar books in the "Read Also" column, or choose other free books by Walter Holbrook Gaskell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
But in the nose, as in all other parts of the head-region of the lamprey, remarkable changes take place at transformation, and examination of the same tube in Ammocoetes demonstrates that the elaborate structure of the adult olfactory organ is actually derived from a much simpler form of organ, represented in Fig. 99. Here, in Ammocoetes, the section is no longer strikingly different from that of the Thelyphonus organ, but, instead, most strikingly similar to it.
Thus, again, it is shown that t...his larval form of the lamprey gives -cart Fig. 99. — Tbansvbbsb Section thbodgh the Olfactory Passage of Ammoccetes.
cart., nasal cartilage.
more valuable information as to vertebrate ancestry than all the rest of the vertebrates put together.
Still, even now the similarity between the two organs is not complete, for the tube in the lamprey opens on to the exterior on the dorsal surface of the head, while in the scorpion tribe it is situated ventrally, being the passage to the mouth and alimentary canal.
What to read after The Origin of Vertebrates?
You can find similar books in the "Read Also" column, or choose other free books by Walter Holbrook Gaskell to read onlineMoreLess
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