Study has been made of 19 species of Devonian Rhynchonellid brachiopods, including 7 species of Nudirostra; 1 species of Basilicorhynchus; 5 species of Camarotoechia; 2 species of Pugnoides; 3 species of Hypothyridina; and 1 species of Eatonia.
Internal sections are figured and described of at least one species of each genus from the University of Alberta collections.
An attempt has been made to place the Devonian Rhynchonellids in previously determined Rhynchonellid zones, although little information is available to the exact stratigraphic positions of the collections.
The Devonian Rhynchonellid zones are compared to the zones proposed by Warren and Stelck (1950), with an attempt to clarify any discrepancies which arise. General conclusions follow the above comparisons.