4 INTRODUCTION. 



but as it is necessary to use the names of several of the major 

 divisions in the general account of the vertebrates, a tabular 

 statement of classification with familiar examples is given here. 

 Details can be found by reference to the index. 



VERTEBRATA. 



Cyclostomata (without true jaws). 



Myxinoidei (hag-fishes, borers, Myxine). 

 Petromyzontes (lampreys). 

 Gnathostomata (with jaws). 



Ichthyopsida (with gills in adult or young). 

 Pisces (with paired fins). 



Elasmobranchii (sharks and skates). 



Holocephali (elephant-fish, Chimcerd). 

 Ganoidea (sturgeon, garpike, etc.). 

 Dipnoi (lung-fishes). 

 Teleostei (ordinary bony fishes). 

 Amphibia (frogs, toads, salamanders, etc.). 

 Sauropsida. 



Reptilia (lizards, snakes, turtles, alligators). 

 Aves (birds). 

 Mammalia (rats, cats, elephants, whales, man, etc.). 



