The photo at left indicates the three fused bones that make up the coxal bone (os coxa or innominate bone). The photo at right shows the markings for which you are responsible
In order to determine if a coxal bone is right or left, hold it with acetabulum facing laterally and the obturator foramen inferior (down). Now all you need to do is determine which side is anterior vs posterior, which can be done by looking for the pubic symphysis (anterior) or the sciatic notches (posterior). The specimen in the photo is a right coxal bone.
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