Some savage tribes have long and thick nails resembling the claws of beasts, and use them in the same way as the lower animals.

There is a description of a person with finger-nails that resembled the horns of a goat.
Neuhof, in his books on Tartary and China, says that many Chinamen have two nails on the little toe, and other instances of double nails have been reported.
The nails may be reversed or arise from anomalous positions.
Bartholinus speaks of nails from the inner side of the digits; in another case, in which the fingers were wanting, he found the nails implanted on the stumps.

Tulpius says he knew of a case in which nails came from the articulations of three digits; and many other curious arrangements of nails are to be found.
Rouhuot sent a description and drawing of some monstrous nails to the Academie des Sciences de Paris.

The largest of these was the left great toe-nail, which, from its extremity to its root, measured 4 3/4 inches; the laminae of which it consisted were placed one over the other, like the tiles on a roof, only reversed.

This nail and several of the others were of unequal thickness and were variously curved, probably on account of the pressure of the shoe or the neighboring digits.