CONTENTS. 



PART I INVERTEBRATE ANIMALS. 



Pape 



MEANING of the Term Zoology 1 



Structure, the Basis of Correct Classification 2 



Animals arranged in four primary Groups 3 



RADIATA, OR RAYED ANIMALS. 



Meaning of the Term < 3 



Group divided into four Classes 4 



CLASS I. INFUSORIA, OR INFUSORY ANIMALCULES. 



Their Size and Distribution 5 



Arrangement in two Divisions Advantage of Scientific Terms 



Polygastrica, or Many- Stomached 6 



Experiments of Ehrenberg Cilia 7 



Rotifer a, or Wheel-bearing Their Tenacity of Life Different Modes 



of Reproduction among the Infusoria 8 



Physical Changes effected through their A gency 10 



CLASS II. ENTOZOA, OR INTESTINAL WORMS. 



Their Abodes Variety of Structure The Tape- worm 12 



Multitude of Ova in another Species These Creatures not produced 

 by Equivocal Generation Perfection of their Structure 18 



CLASS III. ZOOPHYTA, OR POLYPES. 



Meaning of these Terms 14 



The Class subdivided into four Orders 15 



ORDER I. HYDROIDA, OR THOSE RESEMBLING THE HYDRA 15 



The Fresh-water Hydra 15 



Appearance, Habits, and Modes of Reproduction 1 G 



Tubuluria, its living Flowers and diffusion of the young Germs 1 7 



Sertulariada, or those which resemble miniature Flowers .... 18 



Structure 18 



Food, Ova, Numbers, Luminosity 19 



