Albian to Cenomanian
Texas to New Mexico
Original description from Cooke (1946, p. 219): "Test subcircular, tumid, margin rounded, deeply depressed at the peristome, slightly depressed below the periproct. Apical system central; five ocular plates, four genital plates, the madreporite large and extending backward between the posterior ocular plates, which are widely separated. Ambulacral areas about half as wide as the inter-ambulacral areas; plates very short and wide, one pair of pores to the plate; poriferous zones consisting of a single row of pore pairs, continuous to the peristome, pore pairs transverse except near the peristome, where they become diagonal; pores of a pair diverging inward, causing the pore pairs to appear wider where corroded. Peristome central, sunken, transversely oval, slightly notched, diameter about one-fourth that of the test. Periproct large, flush, subpyriform, oblique, extending above the margin. Tubercles large, perforated, in deep scrobiculi, closer together on the under surface; inter-mediate spaces granula."