A talon cusp may have an x-shaped appearance when viewed occlusally. Although large, talon cusps may not require treatment. It is best to diagnose a talon cusp as early as possible before any gingival ...
Goldstein, Marcus S. 1931. "The cusps in the mandibular molar teeth of the Eskimo." American Journal of Physical Anthropology, 16, (2) 215–235.