Cornuate

[…] that in the higher apes, Troglodytes, Pithecus, the posterior cavity of the tricornate ventricle becomes of larger dimensions than in Cercopithecus, although far inferior in size and diverse in shape, from the much deeper, and more incurved cornuate bay which forms the digital cavity of man.

Five species of cornuate osteostracans have been discovered at Devils Hole, and a further three or four species are probably represented by indeterminate fragmentary material.

Surgical treatment consisted of excision of the accessory tarsal navicular or medial protuberance of a prominent cornuate-shaped navicular combined with simple replication of the tibialis posterior tendon without altering its course.