corneous

It had vanished during his babyhood leaving only a corneous spot on his skull; but people were glad when Tomlin died.

From Time Magazine Archive

Armature: applied to the spinous or chitinous processes on the legs, body or wings; or the corneous parts of genitalic structures.

From Explanation of Terms Used in Entomology by John. B. Smith

Ossicula: small corneous pieces that serve in the articulation of the wings to the thorax.

From Explanation of Terms Used in Entomology by John. B. Smith

Base of these wings in the male with a strong bristle passing behind a strong corneous retinaculum, which arises from the anterior side of the sub-costal nervure.

From Discoveries in Australia, Volume 1. With an Account of the Coasts and Rivers Explored and Surveyed During The Voyage of H.M.S. Beagle, in the Years 1837-38-39-40-41-42-43. By Command of the Lords Commissioners of the Admiralty. Also a Narrative Of Captain Owen Stanley's Visits to the Islands in the Arafura Sea. by John Lort Stokes

The silicious sponges with simple spicules appear to have existed as far back as the Siluro-Cambrian, and there is believed to be almost as early evidence of horny or corneous sponges.

From The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants by Sir J. William Dawson