Transform Boundaries The final type of boundary is one where the two plates slide against each other in a sideways motion. These boundaries between plates is referred to as transform boundaries.
The three regions of the body of the Mollusk are the head-foot, the visceral mass, and the mantle-shell.
â¢ The visceral mass is the central section of the molluskâs body that contains the molluskâs organs. â¢ Outside of the visceral mass is a heavy fold of tissue called the mantle that forms the outer layer of the body and that secretes the molluskâs shell.