In order to analyze the cephalofacial morphological differences between Presbytis phayrei and P. francoisi, Cartesian coordinate data were used.

• 本文利用三维笛卡儿空间座标对菲氏叶猴(Presbytis phayrei)和黑叶猴(P.；francoisi)颅骨的形态结构作了比较研究；描绘了它们的侧视和俯视投影图形。