90 STUDIES OP ANIMAL LIFE. 



b. Clavicle, the "collar-bone." 



c. Coracoid. (Both the clavicle and the coracoid 



articulate with the sternum. The coracoid is 

 the longer and more posterior bone of the 

 two.) 



d. Scapula, the "shoulder-blade." (It is partly 



dorsal. ) 

 Is the pectoral girdle attached to the backbone ? 



6. The Arm. (Fore limb.) 



a. Humerus, the bone of the upper arm. 



b. Radio-ulnar, the bone of the forearm. (Compare 



with the human arm.) 

 Why has it a double name ?. 



e. Carpals, the bones of the wrist. 



d. Metacarpals, the bones of the palm. 



e. Phalanges, the bones of the fingers. How many 



in each finger ? Compare with your own. 



f. What sort of a joint do you find at the shoulder ? 



At the elbow ? At the wrist ? 

 Why are the hand and wrist composed of so 



many small bones ? 

 How is the human arm given greater freedom of 



motion than the frog's arm ? 



7. The Pelvic Girdle. 



The pelvic girdle is the girdle of bones to which the 

 hind limbs are attached. It resembles the " wish- 

 bone " of a bird in shape. 



a. Where is the girdle attached to the vertebral col- 



umn ? 



b. Can you explain now how the "hump " is formed ? 

 What is the advantage of the " hump " ? 



8. The Leg. (Hind limb.) 



a. Femur, the "thigh-bone." , 



