An Unusual Sauropsid Dentition.

A small sauropsid dentary from Emborough Quarry, Somerset, of Upper Triassic age, and with an unusual dentition, is described. The dentition is heterodont, with simple conical anterior teeth and transversely broadened cheek teeth which are tricuspid or multicuspid. The jaws of another reptile from Ruthin Quarry, Glamorgan, also of Upper Triassic age, are also described. This second reptile has transversely broadened tricuspid cheek teeth, the anterior part of the jaws forming an edentulous beak. Both reptiles are shown to be related to Trilophosaurus buettneri Case, but generically distinct. The new reptiles are named Variodens inopinatus gen. et sp. nov. (Emborough specimens) and Tricuspisaurus thomasi gen. et sp. nov. (Ruthin specimens).