1876, David Starr Jordan, Manual of the Vertebrates of the Northern United States, page 310:
1. POLYODON, Lacepede. DUCK-BILLED CATS.
= Spatularia, Shaw.
= Planirostra, Lesucur.
1. P. folium, Lacepede. DUCK-BILLED CAT. SPOON-BILLED STURGEON. Snout nearly 1/3 of length; […]. A singular fish, bearing considerable resemblance to a shark.
1878 May 3, David Starr Jordan, A Catalogue of the Fishes of the Fresh Waters of North America:
ACIPENSERIDÆ.
4.—ACIPENSER Linnæus. 1758. Sturgeons.
13. Acipenser rubicundus Le Sueur. Great Lakes and north.
[…]
POLYODONTIDÆ.
6.—POLYODON Lacépède. 1798. Duck-billed Cats.
17. Polyodon folium Lacépède. Mississippi Valley.
1896, Ulysses Orange Cox, A Report Upon the Fishes of Southwestern Minnesota, in the Report of the Commissioner of Fish, page 605:
Fishes from the Minnesota River and its tributaries:
1. Ichthyomyzon castaneus Girard. Lamprey. One specimen was taken from [the] Minnesota River at Mankato in 1892, and so far this is the only one that has been recorded.
2. Polyodon spathula (Walbaum). Paddle-fish; Spoon-bill; Duck-billed Cat. Several specimens have been taken […]
1922, Laws of the State of Mississippi, chapter 181, section 16(a), page 180:
For the purpose of this act the following shall be considered as gross fish: Spoon-bills (paddle-fish), duck-billed cats, bow-fins […] buffalo fish, suckers, gaspergou (fresh water drum, thunder pumper), […]