The cups are small, varying much in color and the sporidia are ellipsoidal.
Here it is usually enclosed in the cephalis and is spherical, ellipsoidal or spheroidal, often flattened almost into a disc.
Cortical shell twice as long as broad, with rough surface, four times as large as the ellipsoidal medullary shell.
Differs from the preceding in the ellipsoidal form of both medullary shells, and in the finer structure of the spongy framework.
The Ellipsoidal Central Capsule, with one axis elongated, so that it becomes the vertical main axis of the body.
Therefore Phatnaspis repeats the characteristic formation of Coscinaspis, from which it differs in its ellipsoidal shell.
Shell composed of four concentric shells, two ellipsoidal cortical shells, and two spherical medullary shells.
Medullary shell (fig. 9) half as large as the cortical, ellipsoidal and papillate, with regular, circular pores.
This species being observed alive, showed a transparent central capsule of ellipsoidal form, two-thirds as large as the shell.
Small animals with ellipsoidal form and about twice as long as broad.