376 CHECK-LIST OF NORTH AMERICAN BIRDS. 



Ichthyoniis Sgilis (Marsh). [13.] 



Graculavus agilis Mabsh, Amer. Journ. Sci., ser. 3, V, 1873, 230. 



Cretaceous (Niobrara); Kansas. 



Ichthyomis Snceps (Marsh). [14.] 



Graculavus anceps Marsh, Amer. Journ. Sci., ser. 3, III, 1872, 364. 



Cretaceous (Niobrara); Kansas. 



Ichthyomis dispar Marsh. [12.] 



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



Cretaceous (Niobrara); Kansas. 



Ichthyomis lentus (Marsh). [15.] 



Graculavus lentus Marsh, Amer. Journ. Sci., ser. 3, XIV, 1877, 253. 



Cretaceous; Texas. 



Ichthyomis tener Marsh. [16.] 



Ichthyornis tener Marsh, Odontomithes, 1880, 198, pi. xxx, fig. 8. 



Cretaceous (Niobrara); Kansas. 



Ichthyomis vdlidus Marsh. [17.] 



Ichthyornis validus Marsh, Odontomithes, 1880, 198, pi. xxx, figs. 11-14. 



Cretaceous (Niobrara); Kansas. 



Ichthyomis victor Marsh. [18.] 



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



Cretaceous (Niobrara); Kansas. 



Familt APATORNITHID.ffl. 

 Genus APATORNIS Marsh. 



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

 by monotypy, Ichthyornis celer Marsh. 



