APPENDIX 205 



Class 2. Amphibia. Amphibians. Vertebrates with gills during a 

 part or all of their life, and usually with lungs ; scales mostly absent. 

 Ex. Kana. 



Class 3. Reptilia. Reptiles. Vertebrates with body covered with 

 horny scales or plates and without gills. Ex. Coluber. 



Class 4. Aves. Birds. Feathered vertebrates whose anterior ap- 

 pendages are wings. Ex. Gallus. 



Class 5. Mammalia. Mammals. Hair-covered vertebrates which 

 suckle their young. Ex. Felis. 





