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FIRST BOOK OF ZOOLOGY. 



ropsida^ which includes the Eeptiles, and Birds ; and lastly 

 Ifammalia. 



Ichthyojmda is derived from two Greek words, ichthus^ 

 a fish, and opsis^ appearance. Sauropsida comes from two 

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



O 



Tehtebbates. 



