Scolecomorphus kirkii is the largest species of Scolecomorphus; adults range from 215-463 mm in length. There are 130-152 primary annuli. Dorsally, the coloration is lavender-gray; this coloration extends ventrally so that it encroaches on the sides of the venter. Midventral surfaces are flesh or cream colored. The top and sides of the head are dark, but a light area is visible along the tentacle tract. Eyes are located on the tentacles, which allows the eyes to be projected outside the skull when the tentacles are extruded, and the black retina is visible through the skin and skull bones.