2 VERTEBRATA. 



** With cold Hood: heart with one or two auricles, 

 and one ventricle. 



III. REPTILIA ^Oviparous animals; breathing by 

 lungs. Body covered with scales or shelly plates. 

 Impregnation effected by sexual union : the young 

 undergoing no metamorphosis. 



4 



IV. AMPHIBIA Oviparous animals; breathing by 



lungs and gills. Body covered with a soft naked 

 skin : feet without claws. Eggs impregnated after 

 exclusion: the young undergoing metamorphosis. 



V. PISCES Oviparous animals; breathing by gills 



only. Body covered with scales, and furnished 

 with fins instead of feet. 



