Ligament wanting; shell gaping, with a styloid apophysis in the umbonal cavities.
The ulna should be cut obliquely, leaving the base of the styloid process, and removing all the cartilage-covered portion.
A styloid process is more or less distinctly visible in the Chimpanzees.
styloid sty·loid (stī'loid')
Of or relating to any of several slender pointed bone processes, especially the spine that projects from the base of the temporal bone.