Permian
Links
Systematics of the Synapsida
http://www.ucmp.berkeley.edu/synapsids/synapsidasy.html
Cladogram with links to pages on the Dinocephalids, Pelycosaurs, Dicynodonts, Cynodonts, Mammals and Gorgonopsids.
The Permian
http://www.ucmp.berkeley.edu/permian/permian.html
An overview of the period from the UC Berkeley Museum of Paleontology.
Permian Geography
http://vishnu.glg.nau.edu/rcb/Permian.html
Description and maps of the continents as they existed at the time.