The generic name Cornwallatia is proposed to replace Cornwallia Hoare, 1964, non Wilson, 1932. A new species of the genus Bayhaium, B. vallum, has been found associated with Cornwallatia tabularia (Hoare) in the basal portion of an unnamed Wolfcampian limestone unit exposed in the Roland Quadrangle, Elko County, Nev. The only other described species of the genus, B. merriamorum Langenheim and McCutcheon, is from the McCloud Limestone in Shasta County, Calif.