Comparative Zoology, Structural and Systematic; For Use in Schools and Colleges
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Comparative Zoology, Structural and Systematic; For Use in Schools and Colleges

Comparative Zoology, Structural and Systematic; For Use in Schools and Colleges


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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 edition. Excerpt: ...grand division of the Animal Kingdom has its characteristic method of developing. Protozoans differ from all higher forms in having no true eggs. The egg of the Hydroid, after segmentation, becomes a hollow, pear-shaped body, covered with cilia. Soon one end is indented; then the indentation deepens until it reaches the interior and forms the mouth. The animal fastens itself by the other end, and the tentacles appear as buds. In the Sea-anemone, the stomach is turned in, and the partitions appear in pairs. In the Oyster, the egg segments into two unequal parts, one of which gives rise to the digestive tract and its derivatives, while from the smaller part originate the skin, gills, and shell. It is soon covered with cilia, by whose help it swims about. The embryo of an Insect shows from the first a right and left side; but the first indication that it is an Articulate is the development of a series of indentations dividing the body into successive rings, or joints. Next, we observe that the back lies near the centre of the egg, the ventral side looking outward; i. e., the embryo is doubled upon itself backward. And, finally, the appearance of three pairs of legs proves that it will be an Insect, rather than a Worm, Crustacean, or Spider. The Vertebrate embryo lies with its stomach towards the yolk, reversing the position of the Articulate; but the grand characteristic is the medullary groove, which does not exist in the egg of any Invertebrate. This feature is connected with another, the setting apart of two distinct regions--the nervous and nutritive. There are three modifications of Vertebrate development: that of Fishes and Amphibians, that of True Reptiles and Birds, and that of Mammals. The amnion and allantois are wanting in the...


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Product Details
  • ISBN-13: 9781154752809
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 102
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1154752801
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 195 gr

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Comparative Zoology, Structural and Systematic; For Use in Schools and Colleges
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