Xll CONTENTS 



CHAPTER XII 



PAGB 



PHYLUM III. CCELENTERATA (HOLLOW INSIDE) (Hydroids, Corals, Jelly- 

 fishes, Etc.) 173 



CHAPTER XIII 



UNSEGMENTED WORMS (at least four Phyla, including Flat-worms, Thread- 

 worms, Rotifers, Polyzoa, Etc.) 190 



CHAPTER XIV 



PHYLUM VIII. ECHINODERMATA (Starfish, Sea-urchins, Sand-dollars, Sea- 

 lilies) 207 



CHAPTER XV 

 PHYLUM IX. ANNUL ATA (Segmented Worms) 222 



CHAPTER XVI 

 PHYLUM X. MOLLUSCA 239 



CHAPTER XVII 

 PHYLUM XI. ARTHROPODA 265 



CHAPTER XVIII 

 PHYLUM XII. CHORDATA 311 



CHAPTER XIX 



CHORDATA (CONT.) : SUB-PHYLUM VERTEBRATA (Fishes, Amphibians, Reptiles, 



Birds, and Mammals) . 3 J 5 



CHAPTER XX 

 CLASS I. PISCES 358 



CHAPTER XXI 

 CLASS II. AMPHIBIA (Frogs, Toads, Salamanders) . 375 



CHAPTER XXII 



CLASS III. REPTILIA (Lizards, Crocodiles, Tortoises, Snakes) 384 



CHAPTER XXIII 

 CLASS IV. AVES (Birds) 398 



CHAPTER XXIV 

 CLASS V. MAMMALIA (Mammals) 437 



