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In the horse it arises, by a small tendon, from a tubercle which occupies the external surface of the os unguis, or lachrymal bone.

It is a thin, clear white shell, and is well named, from unguis, a finger-nail, which it much resembles.

Nail: a tarsal claw: specifically the stout pointed claws in predatory Heteroptera = unguis.

Secondly and thirdly, Bignonia unguis with its close allies, and Cardiospermum; but their tendrils are so short that their contraction could hardly occur, and would be quite superfluous.

The malar bone, and the os unguis or lachrymal, are more or less developed according to the species considered.