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 in a detailed manner the following ques- 

 tions : 



(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? 



* In case one or more of these forms are not studied the columns 

 will be correspondingly less in number. 



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