Reptilia

Amniotes- eggs have an amnion (double membrane) that permits embryo to breathe on land. Cold blooded, have scutes (external plate) or scale, tetrapod (4 legs), most are oviparous (egg laying). 

Image: https://upload.wikimedia.org/wikipedia/commons/thumb/2/2c/Extant_reptilia.jpg/300px-Extant_reptilia.jpg

Info:

 http://en.wikipedia.org/wiki/Reptilia