 In the front of the upper jaw there are several fang-like teeth, then 4-5 sharp teeth which form a single row on the palatine followed by a single row of smaller teeth on premaxilla.The lower jaw has a single large canine-like tooth at its apex followed by a row of smaller sharp teeth along the each side of the jaw.It is grey in colour on the back with a countershaded pattern of a white underside, sometimes the flanks show a yellow tint.