2. Zundel's labial sutures.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
The nostrils become more or less immovable, and the naso-labial fold is obliterated, whilst the lower lip hangs down.
"On Snake-Poison: its Action and its Antidote"
A. Mueller
It was a bare labial whisper.
"The Desired Woman"
Will N. Harben