TABLE OF CONTENTS IX 



Page 

 Organs of response: In amoeba, hydra, annelids, arthropods, verte- 

 brates. Skeleton and connective tissue. The endoskeleton of 



vertebrates. Muscular action 172 



The nervous system: Coelenterates. Annelids. The mechanism of re- 

 sponse. Arthropods. Vertebrates. The brain and spinal cord. 



A spinal nerve. The cranial nerves 182 



Energy relations of the animal: The food of animals a source of 

 energy. Digestion in amoeba. Fermentation and digestion. 

 Digestion in coelenterates, in worms, in arthropods. The diges- 

 tive tract of vertebrates. Digestive ferments. Absorption. , . 191 

 Circulation: The gastro-vascular cavity of coelenterates. Circulation 



in worms, in arthropods, in vertebrates. The lymphatic system. 204 

 Respiration: in minute animals, in aquatic animals, in insects, in 



vertebrates. The blood as respiratory vehicle 208 



Metabolism: growth, secretion and excretion, muscular activity . . 213 

 Excretion: in minute animals, in worms, in crayfish, in vertebrates . 215 

 Reproduction: amoeba, conjugation, hydra, annelids, crayfish, verte- 

 brates 217 



APPENDIX TO PART II 



Classes of Animals 



Phylum I. — Protozoa: Classes of protozoa 224 



Phylum 2. — Coelenterata: Porifera. Structure of a sponge. Hy- 



drozoa. Scyphozoa. Anthozoa. Ctenophora 230 



Phylum 3. — Scolecida: Platyhelminthes. Aschelminthes. Nemer- 



tini 224 



Phylum 4. — Annelida: Classes of annelids 247 



Phylum 5. — Molluscoidea : Bryozoa. Brachiopoda 248 



Phylum 6. — Echinodermata: Pelmatozoa. Asteroidea. Structure 



of star fish. Ophiuroidea. Echinoidea. Holothuroidea ... 250 

 Phylum 7. — Arthropoda: Branchiata. The orders of Crustacea. 

 Palaeostraca. Arachnoidea. Protracheata. Myriapoda. Aptery- 

 gogenea. Insecta. Structure of an insect. The orders of 



insects 259 



Phylum 8. — Mollusca: Amphineura. Conchifera. Orders of Con- 

 chifera. Structure of a snail. Structure of a clam. Structure of 



of a squid 275 



Phylum 9. — Adelochorda 284 



