78 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, I3I 



Chlidonias niger (Linnaeus) : Black Tern 

 Sterna nigra Linnaeus, Syst. Nat., ed. 10, vol. i, 1758, p. 137. 



Modern form reported from late Pleistocene : Fossil Lake, Oregon, 



Suborder ALCAE: Auks 



Family ALCIDAE: Auks, Murres, and Puffins 



Subfamily NAUTILORNITHINAE : Nautilornithes 



Genus NAUTILORNIS Wetmore 



Nautilornis Wetmore, Ann. Carnegie Mus., vol. 16, Apr. 10, 1926, p. 392. 

 Type, by original designation, Nautilornis avus Wetmore. 



Nautilornis avus Wetmore 



Nautilornis avus Wetmore, Ann. Carnegie Mus., vol. 16, Apr. 10, 1926, p. 392, 

 pi. 36, figs. 1-8. 



Eocene (Lower Green River formation) : White River, Utah, 2 

 miles from Colorado State line. 



Nautilornis proavitus Wetmore 



Nautilornis proavitus Wetmore, Ann. Carnegie Mus., vol. 16, Apr. 10, 1926, 

 P- 394, Pl- 36, fig. 9- 



Eocene (Lower Green River formation) : White River, Utah, 2 

 miles from Colorado State Hne. 



Genus HYDROTHERIKORNIS Miller 



Hydrotherikornis A. H. Miller, Univ. California Publ., Bull. Dept. Geol. Sci., 

 vol. 20, No. 3, Apr. 21, 1931, p. 24. Type, by monotypy, Hydrotherikornis 

 oregonus Miller. 



Hydrotherikornis oregonus Miller 



Hydrotherikornis oregonus A. H. Miller, Univ. California Publ., Bull. Dept. 

 Geol. Sci., vol. 20, No. 3, Apr. 21, 1931, p. 24, fig. i. 



Upper Eocene (Arago series) : Sunset Bay, near Coos Bay, Coos 

 County, Oregon. 



Subfamily ALCINAE: Auks and Murres 



Genus AUSTRALCA Brodkorb 



Austratca Brodkokb, Florida Geol. Surv. Rep. Invest. No. 14, November 1955, 

 p. 25. Type, by original designation, Australca grandis Brodkorb. 



