This is a low bowl barrow on the western half of the heath. It is next to the road which passes north of the heath. The barrow is not in very good condition, it was excavated in the early 1940's. Its survival is lucky as some barrows were lost during the construction of a second world war airfield.
The name of the barrow is thought to be a corruption of "colt-pixie". These creatures were supposed to lure young ponies to their deaths in the water logged marshy parts of the heath. Another explanation is that the creatures were part horse and called other horses into the barrow.