Amphisbaena

Description: double-headed serpent-dragons with heads at each end of its body. Its name means ‘goes both ways’ in Greek as it could reportedly stick one head inside the mouth of the other, and roll to where it wanted to go.

Some pictures of this creature depict it as having feet, others just as a snake. It was said to be a very evil creature.

"The Amphisbaena has two heads, one in the proper place and one in its tail. It can move in the direction of eaither head with a circular motion. Its eyes shine like lamps. Alone among snakes, the amphisbaena goes out in the cold. Isidore of Seville"  [7th century CE] (Etymologies, Book 12, 4:20):

Powers: Pliny recorded medicinal properties of the beast. Wearing a live amphisbæna will protect pregnant women, and wearing a dead one is a remedy of rheumatism.

Kongelige Bibliotek, Gl. kgl. S. 1633 4º, Folio 54r