X INTRODUCTION. 



The necessity of adapting the sequence of the different orders to 

 the requirements of the parts into which the work is divided has 

 entailed some departure from an ideal scheme, and the following 

 tahle of the orders and suborders arranged in the manner which 

 appears to best represent their mutual relationships is accordingly 

 appended : 



Subclass I. EUTHERIA. 

 Order I. PRIMATES. 



Suborder 1. Anthropoidea. 



2. Lemuroidea. 

 Order II. CHIROPTERA. 



Suborder 1. Megachiroptera. 

 2. Microchiroptera. 

 Order III. INSECTIVORA. 



Suborder 1. Dermoptera. 



2. Insectivora Vera. 

 Order IY. CAKNIVORA. 



Suborder 1. Carnivora Primigenia (or Creodonta). 



2. Carnivora Vera. 



3. Carnivora Pinnipedia. 

 Order V. RODENTIA. 



Suborder 1. Simplicidentata. 

 2. Duplicidentata. 



Group Tillodontia. 

 Order VI. UNGTTLATA. 



Snborder 1. Proboscidea. 



2. Amblypoda. 



3. Hyracoidea. 



4. Condylarthra. 



5. Toxodontia. 



6. Perissodactyla. 



7. Artiodactyla. 

 Order VII. SIRENIA. 



Order VIII. CETACEA. 



Suborder 1. Mystacoceti. 



2. Archaeoceti. 



3. Odontoceti. 

 Order IX. EDENTATA. 



