The shoulder girdle consists of a shoulder blade, collar bone and coracoid on either side. The fore leg (or wing, in case of birds) articulates with the socket formed by the junction of these three bones. In all the ungulates the shoulder blade is high and narrow, the coracoid is never much developed, and the collar bone is absent. In fowls all three bones of the shoulder girdle are well developed, the collar bone being represented by the “wish bone.” =The Pelvic Girdle.=--This consists of three bones on either side, viz., ilium, ischium, and pubis. The first two are directly articulated to the spinal column, while the pubic bones of either side unite below to complete the arch. The three bones of each side of the pelvis are present in all our domestic animals, including the fowls. [Illustration: BONES OF THE SKELETON OF A HORSE 1 Face Bones, 2 Neck Bones or Cervical Vertebræ, 3 Scapula or Shoulder Blade, 4 Humerus or Arm Bone, 5 Radius or Bone of Forearm, 6 Carpus or Knee, 7 Shank Bone or Cannon, 8 Upper Pastern, 9 Lower Pastern, 10 Coffin Bone, 11 Ulna or Elbow, 12 Cartilages of the Rib, 13 Costæ or Ribs, 14 Dorsal Vertebræ or Bones of Back, 15 Lumbar Vertebræ or Bones of Loin, 16 Candal Vertebræ or Bones of Tail, 17 Haunch, 18 Femur or Thigh Bone, 19 Stifle Joint, 20 Tibia, 21 Tarsus or Hock, 22 Metatarsal Bones, 23 Upper Pastern Bone, 24 Lower Pastern Bone, 25 Coffin Bone.] =Legbones of Farm Animals.=--There is one formula for the bones of the fore and hind legs of farm animals. The first segment is a single bone, the humerus of the fore leg, femur of the hind leg. In the next segment there are two bones, radius and ulna in the fore leg, tibia and fibula in the hind leg. In the dog, cat, and Belgian hare the radius and ulna are both well developed and distinct. In ungulates the humerus is short and stout, while the ulna is complete in the pig, rudimentary and behind the radius in ruminants and firmly united with the radius in the horse. Similarly with the hind leg the fibula is a complete bone in the pig, while in the horse there is merely a rudiment of it, attached to the tibia.