抄録
In the cranium f aciale of Macacus f uscatus blyth, the ∠PAN of ΔPNA is small next to that of the human being and is the smallest among other species of animals.
∠APN and ∠PNA are slightly largerr than those of the human being and other animals.
The three angles of ΔPAB are the intermediates of the respective angles of the Gorilla and the Gibbon.
The angles of ΔPNB, moreover, are the intermediates of the respective angles of the Orang-Utan and the Gorilla.
