VERTEBRATA. 101 



3. The Tongue. 



a. What uses has it? 



4. Tactile Organs. 



a. Do you find any ? 

 h. If so, what are they ? 



5. Balancing Organs. 

 a. Do you find any? 



I. Has the animal more than one means of balancing ? 



F. Feeding. 



1. If possible watch the animals feed and drink. 

 (Make a check mark in your table if you have 

 done so.) 



Gr. Respiration. 



1. Does the animal breathe by means of lungs, gills or 



the skin? 



2. If by lungs, note carefully any movements of the 



sides and throat. Is the air breathed in by swal- 

 lowing or by means of a diaphragm? 

 If hy gills, identify them and show by a diagram 

 the course of the water in the process of respira- 

 tion. 



H. General Questions. 



1. How is the animal especially adapted to its mode of 



life? 



2. What means of protection has it ? 



3. With what offensive or defensive weapons is it 



provided ? 



4. What seems to you to be the most characteristic 



thing about the animal ? 



5. According to your table, what points are common to 



all vertebrates? 



