It was a flattened spiral of more than two turns, and during forty years' growth had reached the length of 14.3 inches.

Its height was 3.8 inches, its skin-attachment 1.5 inches in diameter, and it ended in a blunt extremity of 0.5 inch in diameter.

Stephens mentions a dermal horn on the buttocks at the seat of a carcinomatous cicatrix.

Harris and Domonceau speak of horns from the leg.

Cruveilhier saw a Mexican Indian who had a horn four inches long and eight inches in circumference growing from the left lumbar region.