TABLE OF CONTENTS 



I. General Considerations on Animal Form 



A. Descriptive Terms . 



B. Planes and Axes 



C. Symmetry . 



D. Metamerism or Segmentation 



E. Cephalization .... 



F. Homology and Analogy . 



II. The Phylum Chordata 



A. The Characteristics of the Chordates . 



B. The Characteristics of the Vertebrates 



C. The Classification of the Chordates 



III. General Study of Typical Chordates 



A. Amphioxus 



B. A Tunicate 



C. Balanoglossus . . . 



D. Anatomy of a Lamprey 



E.' External Anatomy of the Dogfish 



F. External Anatomy of the Skate 



G. External Anatomy of a Teleost 

 H. Some Ganoid Fishes 



I. External Anatomy of Necturus 



J. External Anatomy of a Lizard 

 K. External Anatomy of the Turtle 

 L. External Anatomy of the Pigeon 

 M. External Anatomy of a Mammal 

 N. Summary . . . . ... 



IV. General Features of Chordate Development 



A. The Chordate Egg 



B. The Cleavage of the Egg and the Formation of the Blastula 



C. Formation of the Gastrula 



D. Formation of the Third Germ Layer, the Neural Tube, and the Notochord 



E. Further History of the Mesoderm ... . . . 



F. The Fate of the Ectoderm ... 



G. The Fate of the Entoderm . ... . . . 



H. The Fate of the Mesoderm and the Formation of Mesenchyme 



V. The Comparative Anatomy of the Integument and the Exoskeleton 



A. General Considerations on the Skeleton 



B. The Structure of the Skin 



C. The Exoskeleton in General . ... 



D. Exoskeleton of Fishes 



E. Exoskeleton of Amphibia 



F. Exoskeleton of Reptiles . ... . . 



