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FIRST BOOK OF ZOOLOGY. 



ropsida, which includes the Reptiles, and Birds ; and lastly 

 Mammalia. 



Ichthyopsida is derived from two Greek words, iehthus, 

 a fish, and opsis, appearance. Saurojisida conies from two 

 Greek words, sauros, a lizard, and ojjsis, appearance. 



Vebtebeate*. 



