Analysis of information sources in references of the Wikipedia article "Cubit" in English language version.
Solinus, cap. 45, uses ulna for cubitus, where Pliny speaks of a crocodile of 22 cubits long. Solinus expresses it by so many ulnae, and Julius Pollux uses both words for the same... they call a cubitus an ulna.
On the roadside the finish is clean and neat, a living fence of intertwined branches between stakes placed an old cubit (the length of a man's forearm or approximately 18 inches) apart.
On the roadside the finish is clean and neat, a living fence of intertwined branches between stakes placed an old cubit (the length of a man's forearm or approximately 18 inches) apart.
... Roman ulna of four feet...