54 STUDIES OF ANIMAL LIFE. 



2. What is peculiar about its position while swimming ? 



3. Why is " fairy shrimp " an appropriate name ? 



4. Is it quick to see ? (Test for this.) 



5. Is it quick to feel ? (Test by touching lightly.) 



6. Which end is the more sensitive ? 



7. What is the probable food of the fairy shrimp ? 



8. Note the " wave of motion " produced by the gills. 



Is it from the anterior to the posterior or vice versa ? 



9. If the gills are swimming organs, in which direction 



ought the wave of motion to be to make the shrimp 

 go forward ? 



10. Can a shrimp remain motionless? In other words, can 



it " stand still " ? 



11. Do the gills ever stop moving ? 



12. By just what means does the shrimp swim ? 



13. What is peculiar about the packet of eggs on the 



female ? 



B. Body Kegions. 



1. Identify head, thorax and abdomen. 



2. Are these regions more distinct than in the crayfish? 



3. Are these crustaceans clad in a " crust "-like shell ? 



4. Which of the body regions are plainly divided into 



somites ? (What is the case in the crayfish ?) 



5. Identify the alimentary canal through the transparent 



body wall. It is ordinarily filled with food and 

 can be seen very distinctly. 



6. Identify the long heart which lies in the thorax 



dorsal to the alimentary canal. It is usually qxiite 

 transparent. 



C. Appendages, etc. 



1. Of the Head : — 



a. How many pairs of antennae are there ? 



