Whitfield, R.P. 1907. Remarks on and descriptions of new fossil Unionidæ from the Laramie clays of Montana. Bulletin of the American Museum of Natural History 23: 623-628. Available electronically.
Whitfield, 1907. Bull. AMNH 23: 624, pl. 41, figs. 7-8.
Whitfield, 1907. Bull. AMNH 23: 627, pl. 41, figs. 6-7.
Whitfield, 1907. Bull. AMNH 23: 624, pl. 38, figs. 1-7.
Whitfield, 1907. Bull. AMNH 23: 624, pl. 40, figs. 1-2.
Whitfield, 1907. Bull. AMNH 23: 624, pl. 42, figs. 1-4.
Whitfield, 1907. Bull. AMNH 23: 624, pl. 41, figs. 1-5.
Whitfield, 1907. Bull. AMNH 23: 625, pl. 40, figs. 3-4.