World Register of Marine Species (WoRMS)
Helix leidyi J. Hall & F. B. Meek, 1855
MolluscaBase eds. (2026). MolluscaBase. Helix leidyi J. Hall & F. B. Meek, 1855&nbsp;&#8224;. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1324846 on 2026-08-29
Hall, J.; Meek, F.B. (1855). Descriptions of new species of fossils from the Cretaceous Formations of Nebraska, with observations upon Baculites ovatus and B. compressus, and the progressive development of the septa in Baculites, Ammonites, and Scaphites. Memoirs of the American Academy of Arts and Sciences, n.s. 5(2): 379-411, pls. 1-8.