McNeil, F.S. 1939. Fresh-water invertebrates and land plants of Cretaceous age from Eureka, Nevada. Journal of Paleontology 13(3): 355-360. Available electronically.
McNeil, 1939. Jour. Paleont. 13(3): 356.
McNeil, 1939. Jour. Paleont. 13(3): 356, pl. 37, figs. 1-3.