Authors	Year	Title
Meek & Worthen	1860	Descriptions of new Carboniferous fossils from Illinois and other western States. Proceedings of the Academy of Natural Science Philadelphia, 1860: 447-472; Philadelphia.
Meek & Worthen	1866	Description of invertebrates from the Carboniferous system. Geological Survey of Illinois, vol.2, Paleontology: 143-423, pl.14-25; Springfield.
Worthen	1890	Description of fossil invertebrates. Geological Survey of Illinois, 8: 148-150, pl.26-27.