Perisphinctes Ammonites
""This Perisphinctes Ammonite from Madagascar is 2 inches across. Perisphinctes is an extinct genus of cephalopod that lived during the Jurassic Period. They are commonly white to tan in color. The shell has characteristic ridges that spiral around the outside surface of the shell. This is a sample of our inventory. Your Perisphinctes ammonite will be similar to the one pictured here.
