4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I3I 



Class AVES : Birds 



Subclass NEORNITHES: True Birds 



Superorder ODONTOGNATHAE: New World Toothed Birds 



Order HESPERORNITHIFORMES : Hesperornithes 



Family HESPERORNITHIDAE : Hesperornithes 



Genus HESPERORNIS Marsh 



Hesperornis Marsh, Amer. Journ. Sci., ser. 3, vol. 3, 1872, p. 360. Type, by 

 monotypy, Hesperornis regalis Marsh. 



Hesperornis crassipes (Marsh) 



Lestornis crassipes Marsh, Amer. Journ. Sci., ser. 3, vol. 11, 1876, p. 509. 



Upper Cretaceous (Niobrara formation) : Western Kansas. 



Hesperornis montana Shufeldt 



Hesperornis montana Shufeldt, Auk, vol. 32, No. 3, July 1915, p. 293, pi. 18, 

 figs. 4, 6, 8, 10, 12. 



Upper Cretaceous (Claggett formation) : i mile above mouth of 

 Dog Creek, Fergus County, Montana. 



Hesperornis regalis Marsh 

 Hesperornis regalis Marsh, Amer. Journ. Sci., ser. 3, vol. 3, 1872, p. 357. 



Upper Cretaceous (Niobrara formation) : Smoky Hill River, 20 

 miles east of Wallace (type locality), and Two Mile Creek, Smoky 

 Hill River, Logan County, Kansas. 



Hesperornis gracilis Marsh 1 

 Hesperornis gracilis Marsh, Amer. Journ. Sci., ser. 3, vol. 11, 1876, p. 510. 



Upper Cretaceous (Niobrara formation) : Near Smoky Hill River, 

 western Kansas. 



Genus CONIORNIS Marsha 



Coniornis Marsh, Amer. Journ. Sci., ser. 3, vol. 45, 1893, p. 82. Type, by 

 monotypy, Coniornis alius Marsh. 



Coniornis altus Marsh 

 Coniornis altus Marsh, Amer. Journ. Sci., ser. 3, vol. 45, 1893, p. 82, text fig. 



Upper Cretaceous (Judith River formation) : Dog Creek, Fergus 

 County, Montana. 



1 Gregory, Condor, vol. 54, No. 2, Mar. 26, 1952, p. 74, concludes that the genus 

 Hargeria, erected for this species by Lucas, is not separable from Hesperornis. 



2 Shufeldt, Trans. Connecticut Acad. Arts Sci., vol. 19, February 1915, pp. 16, 

 75, considers this a synonym of Hesperornis. 



