Muschel, Mussel by Paul Pfurtscheller, 1929ABOUT Vintage wall chart of the anatomy of the "Unio pictorum," (painters mussel). Lithograph on two sheets of paper, mounted on canvas. Author and illustrator was Prof. Dr. Paul Pfurtscheller. Pfurtscheller (1855 1927) produced a series of 39 "Zoologische Wandtafeln" (zoological wall plates) to be used for higher educational purposes. Although he was a modest high school teacher by training he gained recognition by the scientific community worldwide