LITERATURE CITED 



Abel, Othenio. 



1912. Grundzuge der Palaeobiologie der Wirbeltiere, 708 pp., 470 figs. 



Stuttgart. 

 1919. Die Stamme der Wirbeltiere, 914 pp., 669 figs. Berlin and Leipzig. 



1931. Die Stellung des Menschen im Rahmen der Wirlieltiere, 388 pp., 



276 figs. Jena. 

 BowEisr, Charles Franklin. 



1919. Anticlines in part of the Musselshell Valley. U. S. Geol. Surv. Bull. 

 691, pp. 185-209, 1 pi. 

 Broom, Robert. 



1910. On Tritylodon, and on the relationships of the Multituberculata. 

 Proc. Zool. Soc. London, 1910, pp. 760-768, 2 figs. 



1914. On the structure and affinities of the Multituberculata. Bull. Amer. 



Mus. Nat. Hist., vol. 33, pp. 115-134, 9 figs. 

 Cabrera, Angel. 



1932. La incompatibilidad eool6gica: Una ley biol6gica interesante. Anal. 



Soc. Cient. Argentina, vol. 114, pp. 243-260. 

 Cope, Edward Drinker. 



1884. The Vertebrata of the Tertiary formations of the West. Rept. U. S. 



Geol. Surv. Terr., Hayden, vol. 3, 1,009 pp., pis. l-75a. 

 1897. The position of the Periptychidae. Amer. Nat., vol. 31, pp. 335-336. 

 [Numerous other pertinent papers by Cope are listed in the bibliographies 

 published by Osborn and are quoted or discussed in Matthew (Pale. Mem.) .] 

 Douglass, Earl. 



1902a. The discovery of Torrejon mammals in Montana. Science, new ser., 



vol. 15, pp. 272-273. 

 1902b. A Cretaceous and Lower Tertiary section in south central Montana. 

 Proc. Amer. Phil. Soc, vol. 41, pp. 207-224, 1 pi. 



1908. Vertebrate fossils from the Fort Union beds. Ann. Carnegie Mus., 



vol. 5, pp. 11-26, 2 pis. 



1909. A geological reconnaissance in North Dakota, Montana, and Idaho; 



with notes on Mesozoic and Cenozoic geology. Ann. Carnegie Mus., 

 vol. 5, pp. 211-288, 7 pis. 

 Ellis, Arthur Jackson, and Meinzer, Oscar Edward. 



1924. Ground water in Musselshell and Golden Valley Counties, Mont. 



U. S. Geol. Surv. Water Supply Paper 518, 92 pp., 5 pis. 

 Fisher, Ronald Aylmer. 



1925. Statistical methods for research workers, 239 pp. Edinburgh. (6th 



ed., 1936.) 

 Gidley, James Williams. 



1909. Notes on the fossil mammalian genus Piilodus, with descriptions of 

 new species. Proc. U. S. Nat. Mus., vol. 34, pp. 611-626, 1 pi. 



1915. An extinct marsupial fronx the Fort Union with notes on tlie Myrme- 



cobidae and other families of this group. Proc. U. S. Nat. Mus., 



vol. 48, pp. 395-402, 1 pi. 

 1917. Notice of a new Paleocene mammal, a possil^le relative of the titan- 



otheres. Proc. U. S. Nat. Mus., vol. 52, pp. 431-435, 1 fig., 1 pi. 

 1919. New species of claenodonts from the Fort Union (Basal Eocene) of 



Montana. Bull. Amer. Mus. Nat. Hist., vol. 41, pp. 541-556, 



10 figs., 1 pi. 

 272 



