CONTENTS. 



Page. 

 Chapter I. — The Structure of Vertebrates, as exemplified in 



the Catfish 9 



Chapter II. — The Classification of Canadian Fishes 51 



Chapter III. — The Structure and (Classification of Batrachiana . . 80 



Chapter IV. — Account of the Organization of the living and 



fossil Orders of Reptiles 90 



Chapter V. — The Organization of Birds as exemplified in the 



Fowl, with the Characteristics of the Orders of Birds 121 



Chapter VI. — The Structure of the Cat as a type of Mammalia, 



with an account of the modifications of form in the Class 14'i 



Chapter VII. — The Crayfish, Spider and Grasshopper as types of 

 the Morphology of the Arthropods, with the Characteristics of 

 the Orders of Arthropods 190 



Chapter VIII. — The Vermes, Mollusca and MoUuscoidea 218 



Chapter IX. — The Remaining Invertebrate Sub-Kingdoms .... 242 



Chapter X. — General Principles of Zoology 261 



