although the skull is lost and the tooth is the only extant part of mcz 8761, fordyce (1981) was able to diagnose "agorophius" based on existing descriptions of the skull by muller, cope, and agassiz. new specimens from the ashley formation and chandler bridge formation have provided new data on "agorophius", distinguishing it from other oligocene odontocetes from the us eastern seaboard by the condition of its intertemporal condition.