XIV 



CONTENTS. 



Foraminifera, 



Polycystina, 



Sponges, 



Hydra, 

 Hydrozoa, 

 Acalephae, 

 Anthozoa, 



Structure of Shell and Spines, 

 Echinoderm Larvae, 



CHAPTER X. 



FORAMINIFERA, POLYCYSTINA, AND SPONGES. 



CHAPTER XL 



ZOOPHYTES. 



CHAPTER XII. 



ECHINODERMATA. 



Polyzoa, 

 Compound Tunicata, 



CHAPTER XIII. 



POLYZOA AND COMPOUND TUNICATA. 



CHAPTER XIV. 



MOLLUSCOUS ANIMALS GENERALLY. 



Shells of Mollusca, . 

 Tongues of Gasteropods, . 

 Development of Gasteropods, 

 Ciliary motion on Gills, . 

 Organs' of Sense of Mollusks,' 

 Chromatophores of Cephalopods, 



Entozoa, 



Turbellaria, 



Annelida, 



Pycnogonidae, . 



Entomostraca, 



Suctoria, 



Cirrhipeda, 



Shell of Decapoda, 



Metamorphosis of Decapoda, 



CHAPTER XV. 



ANNULOSA OR WORMS. 



CHAPTER XVI. 



CRUSTACEA. 



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