Amphibia And Reptiles
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Eespiration is effected by lungs ; and gills are entirely absent, even during embryonic life. 15. Lateral sense-organs are absent. I 16. The kidneys have no nephrostomes. Each kidney has one separate ureter.
17. There is always a typical cloaca. 1 18. The eggs are meroblastic.
19. Fertilisation is internal, and is effected, with the single exception of Sphenodon, by means of male copulatory organs. --* 20. An amnion and an allantois are formed during development.
Numbers 1, 2, 6, 7, 8, 14, 16, ...18, 20 separate the Eeptiles from the Amphibia. Cf. Also pp. 4 and 5. Numbers 9 (6), 10, 12, and 13 separate them from the Birds and Mammals. Numbers 3, 8, and 1 1 separate them from the Mammals.
The evolution of the classification of the Reptiles has to a certain extent been already treated on pp. 7-9. For a long time only Chelonia or Tortoises. Ophidia or Snakes, and Saurii were recognised as their principal divisions. Then the Crocodiles were separated from the Lizards ; later the Coeciliae were removed from the Snakes and referred to the Amphibia, vii CHARACTERS CLASSIFICATION 279 and ultimately Sphenodon was recognised as deserving a separate position, equal in rank to the other groups.
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To quickly assess the difficulty of the text, read a short excerpt:
Eespiration is effected by lungs ; and gills are entirely absent, even during embryonic life. 15. Lateral sense-organs are absent. I 16. The kidneys have no nephrostomes. Each kidney has one separate ureter.
17. There is always a typical cloaca. 1 18. The eggs are meroblastic.
19. Fertilisation is internal, and is effected, with the single exception of Sphenodon, by means of male copulatory organs. --* 20. An amnion and an allantois are formed during development.
Numbers 1, 2, 6, 7, 8, 14, 16, ...18, 20 separate the Eeptiles from the Amphibia. Cf. Also pp. 4 and 5. Numbers 9 (6), 10, 12, and 13 separate them from the Birds and Mammals. Numbers 3, 8, and 1 1 separate them from the Mammals.
The evolution of the classification of the Reptiles has to a certain extent been already treated on pp. 7-9. For a long time only Chelonia or Tortoises. Ophidia or Snakes, and Saurii were recognised as their principal divisions. Then the Crocodiles were separated from the Lizards ; later the Coeciliae were removed from the Snakes and referred to the Amphibia, vii CHARACTERS CLASSIFICATION 279 and ultimately Sphenodon was recognised as deserving a separate position, equal in rank to the other groups.
What to read after Amphibia And Reptiles?
You can find similar books in the "Read Also" column, or choose other free books by Hans Gadow to read onlineMoreLess
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