COMPARISONS Of VERTEBRATES. 125 



COMPARISONS. 



With five columns, one for fish and dogfish, one for frog, 

 one for turtle and snake, and one each for bird and rat, 

 answer the following questions: 



(1) Is the body bilaterally symmetrical ? 



(2) Are paired appendages present ? 



(3) How many nostrils ? 



(4) How many eyes ? 



(5) How many ears ? 



(6) Are the skeletal parts external or internal ? 



(7) Is the vent dorsal or ventral ? 



(8) Is there a skull ? 



(9) In what plane do the jaws move ? 



(10) Is the back-bone a single structure ? If not, of what 

 is it composed ? 



(11) Are both shoulder and pelvic girdles present ? 



(12) On what side of the alimentary canal is the central 

 nervous system ? 



(13) What parts are found in the central nervous system ? 



(14) To what organs do the first pair of nerves go ? 



(15) To what organs do the second pair of nerves go ? 



(16) How many and what parts do you find in the brain ? 



(17) Are there cavities inside the brain ? 



(18) Is there a peritoneal cavity ? 



(19) In what way is the alimentary canal supported ? 



(20) Do you find in each form liver, spleen, and pan- 

 creas ? 



(21) In what part of the cavity do you find the kidneys ? 



(22) What cavity surrounds the heart ? 



(23) What chambers do you find in the heart ? 



(24) Is the heart dorsal or ventral to alimentary canal ? 



