THE CLASSIFICATION OF ANIMALS 57 



BRANCH XII. CHORDA'TA 



(animals that have a notochord at some stage of their 

 development) 



Class I. Adelochor'da (balanoglossids, et al.). 



Class II. Urochor'da (ascidians, et al.). 



Class III. Leptocard'ii (lancelets). 



Class IV. Cydostom' ata (lampreys and hagfishes). 



Class V. Pisces (pis-sez) (fishes). 



Class VI. Amphib'ia (frogs, toads, salamanders, water-dogs, 



et al.). 



Class VII. Repttt'ia (snakes, lizards, turtles, alligators, et al.). 

 Class VIII. A'ves (birds). 

 Class IX. Mammal' 'ia (mammals). 



