CONTENTS. 



PAGE 



7 



9 

 9 



10 

 . 10 

 . 11 

 11 

 12 

 14 

 15 



Subclass II. Cyclise . 16 



Subclass III. Marsipobranchii 17 



Class II. Pisces . .17 



Subclass I. Elasmobranchii .... 21 



Subclass II. Holocephali . . 28 



Subclass III. Dipnoi . . 29 



Subclass IV. Teleostomi . 30 



Class III. Batrachia 43 



Subclass I. Stegocephali . .43 



Subclass II. Urodela . 4S 



Subclass III. Salientia . . 50 



Class IV. Monocondylia .52 



Subclass I. Reptilia . . . . 52 



Subclass II. Aves . . . 83 



Class V. Mammalia . 102 



Subclass I. Prototheria 102 



Subclass II. Eutheria . .... 104 



