106 GUIDE TO THE AUSTRALIAN MUSEUM. 



it. There are 32 Teetli, viz. — In front, the Incisors or Cutting 

 Teeth, of wliich there are 4 in each jaw ; next to these, the 

 Canines or Eye Teetli, 1 on each side in both upper and lower 

 jaws ; then the Bicuspids, so called from having projections or 

 cusps on the surface, of which there are 3 on each side of each 

 jaw ; and last, the Back Teeth, Molars, or Grinding Teeth, of 

 which also there are 3 on each side of each jaw. The number 

 and position of the teeth are usually expressed by the following 

 formula : — Incisors, frf = 8 ; Canines, ^ = 4 ; Bicuspids, |f| = 8 ; 

 Molars, |7t| = 12. Total, -ff or 32. The teeth, however, are not 

 considered part of the skeleton. 



The Ribs are long curved narrow bones — 12 on each side. They 

 are attached behind to the back-bone and in front to the breast-bone 

 by bands of cartilage or gristle. They form the sides of a kind of 

 box called the " Chest," in which the heart and lungs are placed. 



The Collar-Bones are narrow curved bones extending from the 

 top of the Breast-bone to the shoulders. 



The Shoulder Blades are flat and somewhat triangular shaped 

 bones and form the back parts of the shoulders. The sockets in 

 which the arms move are at the upper corners of these bones. 



The Arm Bones are : — In the upj^er arm, one bone called the 

 Innneinis ; in the fore arm, two bones, the ulna and the radius. 



The Wrist is composed of 8 small bones placed between the 

 two bones of the fore arm and the bones of the hand. 



The Hand has five long narrow bones ; one leads to the Thumb, 

 the others lead each to a finger. The Fingers have each 3 bones, 

 but the Thumb has only 2. 



The Pelvis or Hip Bones are large massive flattened bones, one 

 on each side. They receive the lower end of the back-bone and 

 connect the vertebrae with the legs. They have consequently 

 to carry the entire weight of the body and any load it may bear. 



The Leg Bones are : — The Thigh or femur, a large strong bone 

 forming the upper part of the leg ; the two bones of the leg, the 

 larger called the Shin or tibia, and the smaller called the Splint- 

 bone or fibula ; and the Knee-cap or patella. 



The Ankle is formed of a series of 7 little bones between the 

 leg and the foot. One of them works in the lower end of the 

 bones of the leg and forms the ankle joint, while another projects 

 to form the heel, and is called the os calsis. 



