74 LABORATORY EXERCISES. 



C. Anterior appendage. 



11. Can you distinguish a shoulder-blade 



(scapula) ? 



12. Has the animal a collar-bone (clavicle)? 



13. What fractional part of the length of the 



anterior appendage is formed by the hu- 

 merus? 



14. What is the relative size of radius and ulna? 



15. Are radius and ulna anywhere united or is 



it probable that rotation of the radius 

 about the ulna is possible? 



1 6. Is the projection ("funny-bone '') on radius 



or ulna? 



17. How many wrist-bones (carpals) in the an- 



terior appendage? 



1 8. Does the animal walk on the palm of the 



hand or on the tips of the fingers? 



19. How many fingers (or toes) of anterior ap- 



pendage does it use? 



20. How many bones are there in each finger? 



21. Is a thumb distinguishable? 



22. What use does the animal make of the an- 



terior appendages? (Walk, swim, fly, 

 catch prey, burrow, etc.) 

 D. Posterior appendage, 



23. Is a knee-cap (patella) distinguishable? 



24. What is the relative size of tibia and fibula? 



25. How many ankle-bones (tarsals) are found 



in the posterior appendage? 



26. How many toes of the posterior appendage 



does the animal use ? 



27. Are the bones of the appendages long and 



