152 PROCEEDINGS OF THE PALEOXTOLOGICAL SOCIETY 



There was then presented hy the author a paper on the invertebrate 

 paleontology of a new West Coast Tertiary formation, which was dis- 

 cussed by Doctor Dickerson, with replies by the author. 



FAUNA OF THE MEGAyOS GROUP 

 BY B. L. CLARK 



An interesting fauna of fossil vertebrates was described in the follow- 

 ing paper : 



FOSSIL MAMMALS OF THE TIFFANY BEDS 



BY W. D. MATTHEW AND WALTER GRANGER 



(Al)S'f7'aCt) 



The Tiffany beds are a local phase at the base of the Wasatch north of the 

 San Juan River, in southern Colorado. Fossil mammals were first found there 

 by J. W. Gidley, on whose invitation Mr. Granger explored the deposit in 1916 

 for the American Museum. A small but interesting fauna was secured there, 

 regarded as of uppermost Paleocene age, equivalent to the Clark Fork beds at 

 the base of the Bighorn Wasatch. The fauna includes several new or little 

 known genera of minute size, but of considerable paleontologic interest. 



A paper by President Merriam on the Pliocene of Idaho was next on 

 the program, but its presentation had to be omitted because the material 

 illustrating it had not arrived. 



FAUNA OF THE IDAHO TULARE PLIOCENE OF THE PACIFIC COAST REGION 



BY J. C. MERRIAM 



President Merriam then took the chair and called for a paper on verte- 

 brate paleontology, of which the author presented an abstract. This was 

 discussed by Doctor Matthew. 



REVISION OF THE PSEUDOTAPIRS OF THE NORTH AMERICAN EOCENE 



BY O. A. PETERSON 



(Abstract) 



This abstract is taken from the general report on the Vertebra ta of the 

 Upper Eocene of the Uinta Basin, Utah, ready for publication. In this review 

 is included two new genera of pseudotapirs from the Upper Eocene. A new 

 family and two new subfamilies are proposed. 



A short paper on American fossil rhinoceroses was then presented by 

 Doctor Matthew and discussed by Professor Merriam. 



