448 WILLIAM K. GREGORY 



Order Haplisitia Cope 

 Fam. Tarasiidas 

 Order Osteolepida Boulenger 

 Suborder Rhipidistia Cope 

 Fam, Osteolepidas 



" Rhizodontidae (=Megalichthyidae) 

 ' Holoptychidae 

 Suborder Actinistia Cope 

 Fam. Coelacanthidse 

 Order Cladistia Cope 



Fam, Polypteridae 

 Infraclass Actinopteri Cope 



Cohort Ganoidei (J. Muller) Jordan and Evermann 

 Superorder Acipenseroidei Traquair 



Order Heterocerci Zittel (Lysopteri) Cope 

 Fam, Palaeoniscidas 

 " Platysomidas 

 -- Catopteridas (Dictyopygidas) 

 Order Chondrostei J. Muller 

 Suborder Glaniostomi Cope 

 Fam Chondrosteidae 

 " Acipenseridas 

 Suborder Selachostomi Cope 

 Fam, Polyodontidas 

 Superorder Lepidosteoidei Bridge (Holostei /. Muller in part) 

 Order Protospondyli (A. S. Woodward) 

 Suborder Mesoganoidei nom. nov. 



Fam. Stylodontidas (Semionotidas) 

 " Lepidotidas 

 " Macrosemiida? 

 " Dapediidae » 

 " Pholidophoridae 

 Suborder Pycnodonti » 



Fam. Pycnodontidae 

 Suborder Aspidorhynchi nom. nov. (Aetheospondyli Woodw. 

 in part) 



Fam. Aspidorhynchidae 

 Suborder Ginglymodi Cope (Aetheospondyli Woodw. in part) 



Fam. Lepidosteidas 

 Suborder Halecomorphi Cope (Amioidei Lutken) 



1 Placed near the Pholidophoridae by Boulenger. 



»Cf. Hay, Bibliography and Catalogue of the Fossil Vertebras of 

 North America, p. 372. 



