"Palmar aspect of left fore foot of a black bear (Ursus americanus). scl, scapholunar; c, cuneiform;…

"Right fore foot of Indian Elephant. U, ulna; R, radius; c, cunelform; l, lunar; sc, scaphold; u, unciform;…

Illustration of a trapezium, a quadrilateral having no two sides parallel. The diagonal is labeled in…

Illustration of a trapezoid, with the median drawn. The median of a trapezoid is parallel to the bases,…