404 CHECK-LIST OF NORTH AMERICAN BIRDS. 



Ichthyornis dispar Marsh. 



Ichthijornis dispar Marsh, Amer. Journ. Sci., ser. 3, IV, 1872, 344 

 Cretaceous (Niobrara) : near Solomon River, Kansas. 



Ichthyornis I entus (Marsh). 



Graculavus Icntus Marsh, Amer. Journ. 8ci., ser. 3, XIV, 1877, 253. 

 Cretaceous: near "Fort McKinney", Texas. 



Ichthyornis tener Marsh. 



Ichthyornis tener Marsh, Odontornithes, 1880, 151, 198, pi. XXX, fig. 8. 

 Cretaceous (Niobrara) : Wallace County, Kansas. 



Ichthyornis validus Marsh. 



Ichthyornis validus Marsh, Odontornithes, 1880, 147, 153, 198, pi. XXX, 

 figs. 11-14. 



Cretaceous (Niobrara) : near Solomon River, Kansas. 



Ichthyornis victor Marsh. 



Ichthyornis victor Marsh, Amer. Journ. Sci., ser. 3, XI, 1876, 511. 

 Cretaceous (Niobrara): Wallace and Gove Counties, Kansas. 



Genus APATORNIS Marsh. 



Apatornis Marsh, Amer. Journ. Sci., ser. 3, V, Jan. 21, 1873, 162. Type, 

 by monotypy, Ichthyornis ccler Marsh. 



Apatornis celer (Marsh). 



Ichthyornis celer Marsh, Amer. Journ. Sci., ser. 3, V, 1873, 74. 

 Cretaceous (Niobrara) : Butte Creek, near Smoky Hill River, Kansas. 



SuPERORDER NEOGNATHAE. Non-Struthious 



Birds 



Order GAVIIFORMES. Loons. 



Family GAVIIDAE. Loons. 



Genus GAVIA Forster. 



Gavia J. R. Forster, Enchirid. Hist. Nat., 1788, 38. Type, by subs, 

 desig., Colymbus imbcr Gunnerus = C. immer Brxjnnich (Allen, 1907). 



