The genitalia of a fetal male spider monkey (12), the genitalia of a fetal female spider monkey (13a), a view of the labial fold at the base of the clitoris (13b), the genitalia of an adult male spider monkey (14a), the surface of the penis, magnified to show detailed character of cornified denticles (14b), and a sagittal section through the tip of the penis (14c).