The Ribs.~--There are twelve _ribs_ on each side.

The ribs join the back-bone at the back.

They are connected by cartilage to the breast-bone in front.

They look somewhat like the hoops of a barrel.
With the breast-bone and the back-bone they form a bony cage to contain and protect the heart and the lungs.
~7.

The Pelvis.~--The pelvis is at the lower part of the trunk.