Abstract
The series “Biology of the Reptilia” is a monumental landmark in reptilian biology and has served as the authoritative reference on this topic for a generation of herpetologists. It has surpassed all previous monographic treatments on this taxon and it is difficult to imagine it being superseded in the foreseeable future. Volume 20 in this series treats the skull of the Lepidosauria (tuatara, amphisbaenians, lizards, and snakes).