These sets consist of humerus, radius, femur, and tibia of primates for use in calculating forelimb, hindlimb, and long bone indices. In addition to the Intermembral Index, Humerofemoral, Brachial, and Crural Indices may also be determined with the long bones from these sets. The results are primarily used to suggest, rather than unequivocally determine, locomotive patterns; some common categories of locomotion represented in our Intermembral Sets are Brachiation, Terrestrial Quadrupedalism, Arboreal Quadrupedalism, Vertical Clinger/Leaper, and in some cases a combination of locomotor types.