Later it expands to a convex shape. Outer billiards is a dynamical system based on a convex shape in the plane. Let P be a convex shape in the plane. The cap is conical initially and flattening to a convex shape, with a prominent boss. The carapace is slightly shorter than it is broad and has a highly convex shape. Overall it has a somewhat convex shape, bulging upward toward the middle. The very large shell has a rounded-oval, quite convex shape. The adipose fin is large, does not contain any rays, and has a convex shape. There is a strongly convex shape to the posterior margin of the epimera III. The adipose fin does not contain any rays, and has a convex shape. The caps of the fruit bodies are between wide, with a convex shape. The varietal epithet "convexa" refers to the convex shape of the cap. It has a convex shape, but splits at the margins. A distinctive feature is the convex shape of the leaf faces. The adipose fin is short, does not contain any rays, and has a convex shape.