Agassiz. 1842. Études critiques sur les Mollusques Fossiles 2. Available electronically.
Agassiz, 1842. Études Moll. Fossil. 2: 45, pl. 1, figs. 7-23.
Agassiz, 1842. Études Moll. Fossil. 2: pl. 1, figs. 1-6.
Agassiz, 1842. Études Moll. Fossil. 2: 47, pl. 1, figs. 24-29.