I. BRIEF SURVEY OF THE VERTEBRATES 



Much of the work included in this section will be a review for 

 those who have had a course in General Zoology. However, it 

 is important as a preface to the work which comes later. A 

 knowledge of the general classification of the vertebrates is 

 expected. The following brief outline of the phylum Chordata 

 is included for purposes of reference. 



PHYLUM CHORDATA 



Sub-phyla: I. hemichorda — acorn worms 

 H. UROCHORDA — sea squirts 

 HI. CEPHALOCHORDA — amphioxus 

 IV. VERTEBRATA — fishes, frogs, rcptiles, birds, 

 mammals 



Classes of Vertebrata 



1. Cyclostomata — lamprey 



2. Elasmobranchii — sharks, rays 



3. Pisces — fishes 



Crossopterygii — fossil fishes related to ganoids 

 Dipnoi — lung fishes 



Ganoidei—ga.no{d fishes: garpike, sturgeon 

 Teleostei — common bony fishes: perch, trout 



4. Amphibia — salamanders, frogs, toads 

 Stegocephala — a group of fossil amphibians 

 Caudata — tailed amphibians: salamanders 

 Salie7itia — tailless amphibians: frogs, toads 



5. Reptilia — lizards, snakes, turtles, alligators 

 Thermomorpha — a group of fossil reptiles 

 Squamata — lizards, snakes 



Testudinata — turtles 



Crocodilia — crocodiles, alligators 



6. Aves — birds 



7. Mammalia — mammals 



