These organs retain their normal bilaterality, but the body is, as a rule, inequilateral.
The shells are under an inch in length, and have a peculiarly shortened anterior portion; thus they are inequilateral.
A simple vertical elevation of the occiput, giving the head in most instances a squared and inequilateral form.
The spores are wood brown in color, oval to short elliptical and inequilateral 6–8 × 4–5 µ.
Under the microscope they are yellowish, oval or short oblong, often inequilateral, 6–8 × 4–5 µ.