Steven Avery
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Page 156 - Paper, Leather, Parchment and Vellum
allthingsbibleandmore.com
Note that confusion between the two terms spans back to 1519 as noted in this quote from Wikipedia:
"In 1519, William Horman could write in his Vulgaria:
"That stouffe that we wrytte upon, and is made of beestis skynnes, is somtyme called parchement, somtyme velem, somtyme abortyve, somtyme membraan." [https://en.wikipedia.org/wiki/Vellum#cite_note-11]
And today the term 'membrane' is increasingly used to describe both.4a