A Text-Book of Zoogeography
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The involuntary migration of animals is mainly con- fined to the invertebrates and smaller vertebrates. Some of the former possess special facilities for being carried about from place to place, and it is invariably the case that these species or genera are the most widely dis- tributed. We will commence with a few examples taken from the terrestrial and fresh-water Annelids. Earth- worms as already mentioned are not easily moved from place to place except by their own exertions ; there is here... but little assisted emigration. Rivers it is true could, and doubtless do, convey them for considerable distances, as many jf not all are capable of surviving a prolonged immersion in fresh water. M. Perrier kept an earthworm for some weeks in a vessel of water, and I have made a similar though not so prolonged an experiment myself. This however would not be of much use as a distributing agent unless they were thus enabled to traverse a desert otherwise impassable. It is possible that in this way a peculiar genus of earthworms, Siphono- gast&r, distinguished by a pair of long appendages of problematical use, has been able to pass from tropical Africa to Egypt, the Nile serving as the path.
What to read after A Text-Book of Zoogeography?
You can find similar books in the "Read Also" column, or choose other free books by Frank E Frank Evers Beddard to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The involuntary migration of animals is mainly con- fined to the invertebrates and smaller vertebrates. Some of the former possess special facilities for being carried about from place to place, and it is invariably the case that these species or genera are the most widely dis- tributed. We will commence with a few examples taken from the terrestrial and fresh-water Annelids. Earth- worms as already mentioned are not easily moved from place to place except by their own exertions ; there is here... but little assisted emigration. Rivers it is true could, and doubtless do, convey them for considerable distances, as many jf not all are capable of surviving a prolonged immersion in fresh water. M. Perrier kept an earthworm for some weeks in a vessel of water, and I have made a similar though not so prolonged an experiment myself. This however would not be of much use as a distributing agent unless they were thus enabled to traverse a desert otherwise impassable. It is possible that in this way a peculiar genus of earthworms, Siphono- gast&r, distinguished by a pair of long appendages of problematical use, has been able to pass from tropical Africa to Egypt, the Nile serving as the path.
What to read after A Text-Book of Zoogeography?
You can find similar books in the "Read Also" column, or choose other free books by Frank E Frank Evers Beddard to read onlineMoreLess
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