Reptiles are the first vertebrate adapted for life in dry Places on land. Some live near water or in water, but for the breeding purpose and egg laying they return to land. About 275 million years ago, in the early Carboniferous Period Primitive amphibians were Produced and from them recent amphibians and fully terrestrial animals evolved. The terrestrial stock gave rise to reptiles, birds and mammals(amniotes). Amniotes are those animals whose embroyes are enclosed by a fluid-filled sac called amnion. Reptilia includes 7000 living species of lizards, snakes, tortoises, alligators, crocodiles and tuatara. In the present work the very scientific information based on the latest researches is organised in three volumes. Profusely illustrated the authoritative information contained in this work will prove of utmost use to the students, teachers and researchers.