54 112 Diagram of the bones of the hand with the ends of the radius and ulna. 1, end of _radius_; 2, end of _ulna_; 3, _scaphoid_; 4, _semilunar_; 5, _cuneiform_; 6, _pisiform_; 7, _trapezium_; 8, _trapezoid_; 9, _magnum_; 10, _unciform_; 11, 11, _metacarpal_ bones; 12, 12, first row of _phalanges_; 13, 13, second row of _phalanges_; 14, 14, third row of _phalanges_; I, thumb; II, forefinger; III, middle finger; IV, ring finger; V, little finger. 55 116 Drawing of the front of the chest and the shoulders, with the collar-bones running across from the upper edge of the breast-bone to the projecting processes of the shoulder-blades. 56 117 The chest and shoulder of an Eagle. A, A, the united _collar-bones_, or “merry-thought;” B, the _coracoid_, or “side-bone;” C, the long, slender _shoulder-blade_; D, the _sternum_; E, the _humerus_. 57 120 The head, fore part of chest, and shoulder of a Rhinoceros. The chest is deep and flat at the sides. The shoulder-blade and arm-bone are nearly vertical, that is, they nearly correspond with the ribs in their direction. 58 122 Side view of chest, shoulder and arm (human). The shoulder-blade is prolonged in the direction of the spine, that is, _across_ the ribs. 59 124 Side view of fore part of a Monkey’s skeleton. 60 126 A section, from side to side, through the Elbow-joint, showing the shape of the surfaces of the bones. A, the _radius_; B, the _ulna_; CC, the side _ligaments_ holding the radius and ulna to the _arm-bone_, D. 61 127 The upper limb with the forearm and hand in the state of supination. A, the _long Pronator_ muscle. 62 127 The same in a state of pronation. B, the _short Supinator_ muscle. In this and the preceding drawing a plumb-line, descending from the outer condyle of the humerus traverses the lower end of the ulna and the ring finger. 63 131 Drawing of the _biceps_ muscle. The hand is in a state of pronation. Driving the gimlet is effected by the movement to the state of supination.