Abstract
A new species of Tertiary chiton, Notoplax buicki sp. nov., is described from the Dry Creek Sands (Pliocene, Yatalan) from South Australia. The new species most closely resembles the extant N. speciosa, but is distinguished from it by the elongate lateral teeth on the sides of the jugum, and the more triangular pustules which are not differentiated on the low diagonal rib separating the lateral and pleural areas.