# The Origin of Vertebrates

Author: Gaskell, Walter Holbrook, 1847-1914

Genre: Category: Science - Biology

Language: English

License: Public domain

Source: https://www.gutenberg.org/ebooks/44000

Amazon editions: https://www.amazon.com/s?k=The+Origin+of+Vertebrates+Gaskell&tag=cyberlibrar00-20

## Summary

Theories of the origin of vertebrates--Importance of the central nervous system--Evolution of tissues--Evidence of Palæontology-- Reasons for choosing Ammocoetes rather than Amphioxus for the investigation of this problem--Importance of larval forms-- Comparison of the vertebrate and arthropod central nervous systems--Antagonism between cephalization and alimentation-- Life-history of lamprey, not a degenerate animal--Brain of Ammocoetes compared with brain of arthropod--Summary 8

## Chapters

- [Chapter IV., the probability of the theory that the trigeminal group of](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/18/index.md)
- [part C is modified to form an optic sense-plate, then an invagination](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/16/index.md)
- [CHAPTER XV](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/15/index.md)
- [Chapter XII., which, according to Kowalewsky and others, give origin to the](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/19/index.md)
- [Chapter IV., the respiratory muscles arose from the dorso-ventral muscles](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/17/index.md)
- [CHAPTER XII](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/12/index.md)
- [CHAPTER XI](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/11/index.md)
- [CHAPTER III](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/3/index.md)
- [CHAPTER V](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/5/index.md)
- [CHAPTER XIII](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/13/index.md)
- [CHAPTER IV](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/4/index.md)
- [CHAPTER VI](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/6/index.md)
- [CHAPTER XIV](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/14/index.md)
- [CHAPTER VIII](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/8/index.md)
- [CHAPTER I](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/1/index.md)
- [CHAPTER IX](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/9/index.md)
- [CHAPTER II](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/2/index.md)
- [CHAPTER VII](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/7/index.md)
- [CHAPTER X](https://www.cyberlibrary.org/en/books/the-origin-of-vertebrates-44000/chapters/10/index.md)