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Aulacodiscinæ.—Valves with mammiform elevations near the border surmounted by nipple-like processes.

AULACODISCUS—THE ONLY GENUS AS ABOVE

Eupodiscinæ.—Valves with ocelli.

(1) Actinocyclus.—Valve with one small ocellus; striæ radial.

(2) Eupodiscus.—Valve with one or more ocelli; striæ not radial.

(3) Auliscus.—Valve with large, elevated ocelli. Central area hyaline. Markings granular and costate.

(4) Pseudauliscus.—Valve with radiating granules. No central space.