Proteroglossa: Rhinophrynidae.
Cope, 1864. "On the limits and relations of the Raniformes."[[68]] He introduces the shoulder-girdle and the sacral diapophyses, and drops the discs as too adaptive and misleading. He distinguishes between Raniformes and Arciferi.
Cope, 1865. "Sketch of the primary groups of the Batrachia Salientia."[[69]]
Aglossa.
Bufoniformia (Bufonidae).
Arcifera (Discoglossidae, Scaphiopodidae, and Hylidae).
Raniformia.
In 1867 Cope separates the genus Hemisus as Gastrechmia on account of its peculiar pectoral arch.[[70]]
In 1875, "Check-list of North American Batrachia and Reptilia," Cope elaborates his system:
Class Batrachia. Order Anura.