These are bivalve shells. This means the mollusk has created a bottom shell and a matching top shell, joint together by a ligament. Most scallops have been gathered for centuries as food. The young scallops usually attach themselves to hard objects with their byssus. Mexican Deep Scallops, like other scallops prefer offshore sandy or stone filled sea floors. These Scallops are found in the Eastern Pacific. The picture gives a good example of the color, shape and markings of the species. It is not possible to show the uniqueness of each shell, created by time and the natural elements.