80 University of California Publications in Geology [Vol.7 



the lakes in central eastern Tierra del Fuego, lat. 53° S, where they are 

 said to breed, and certainly spend a part of the season. This region cor- 

 responds in temperature to the climate of central Alberta, Canada, 400 

 miles north of Silver Lake. Thus it appears that the presence of Phoenicop- 

 terus copei at Silver Lake has very little weight in the determination of 

 climate. It is more probable that the northern lakes of that period con- 

 tained mollusks on which the flamingoes fed. ' ' 



Aside from an extinct genus of grouse, Phoenicopterus is the 

 only genus recorded fossil that might not reasonably be expected 

 to occur in the region at the present time. 



Shufeldt's original paper 15 gives a detailed description of 

 most of the species of birds found in the Fossil Lake beds and 

 a synoptical list of the known species was published in a paper 

 by the writer 10 as follows : 



JEehmophorus occidentalis (Lawrence). 



Pygopodes: ^Echmophorus occidentalis (Lawrence). 



Colymbns holboelli (Reinhardt). 



Colymbus auritus Linneus. 



Colymbus nigricollis calif ornicus (Heermann) . 



Podilymbus podiceps (Linneus). 

 Longipennes: Larus argentatus Pontoppidan. 



Larus robustus Shufeldt. 



Larus californieus Lawrence. 



Larus oregonus Shufeldt. 



Larus Philadelphia (Ord). 



Xema sabini (J. Sabine). 



Sterna elegans Gambel. 



Sterna forsteri Nuttall. 



Hydrochelidon nigra surinamensis (Gmelin). 

 Steganopodes : Phalacrocorax maeropus (Cope). 



Pelecanus erythrorhynchos Gmelin. 

 Auseres: Lophodytes cucullatus (Linnaeus). 



Anas platyrhynclios Linnaeus. 



Mareca americana (Gmelin). 



Nettion carolinense (Gmelin). 



Querquedula diseors (Linnaeus). 



Querquedula cyanoptera (Vieillot). 



Spatula clypeata (Linnaeus). 



Dafila acuta (Linnaeus). 



Aix sponsa (Linnaeus). 



is Shufeldt, B. W., Journ. Acad. Nat. Sci. Phila., ser. 2, no. 9, pp. 389- 

 45, 1892. 



ic Miller, L. H., Univ. Calif. Publ., Bull. Dept. Geol., vol. 6, pp. 79-87, 

 1911. 



