188 



FIRST BOOK OF ZOOLOGY. 



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

 Mammalia. 



Ichthyopsida is derived from two Greek words, ickthus, 

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

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



V 



VEKTEBKATES. 



