190 PROCEEDINGS OF THE PALEONTOLOGTCAL SOGIETY 



Page 

 Methods of study and the classification of American Tertiary 



bryozoa [abstract] ; by F. Canii and R. S. Bassler 204 



The paleontology of arrested evolution : IM-esidential address by 



Rudolph Ruedemann 205 



Present status of areal mapping in the Coastal I'lain and of the 



paleontologic investigations in the Coastal Plain, Panama, and 



the AVindward Islands [abstract] ; by T. Wayland A'aughan. . . . 205 



Were the graptolite-bearing shales as a rule deep or shallow 



water deposits'? [abstract] ; by Amadous W. Grabau and 



Marjorie O'Connell 205 



Graptolite zones of the Utiea shale [abstract] ; by Rudolf Ruede- 

 mann 206 



Session of Friday, December 30 206 



Symposium on the interpretation of sedimentary rocks 206 



The problems stated ; by A. W. Grabau 206 



Significance of sedimentary rhythm ; by Joseph Barrell 206 



Diagnostic characteristics of marine elastics; by E, M. Kindle... 207 

 Characteristics of continental elastics and chemical deposits; by 



Eliot Blackwelder 207 



Significance of sorting in sedimentary rocks; by E. W. Shaw 207 



Chemical and organic deposits of the sea ; by T. Wayland Vaughan 207 



Presentation of papers 207 



Devonian and Black Shale succession of western Tennessee [ab- 

 stract] ; by Carl O. Dunbar 207 



Stratigraphic relations of the Tully limestone and the Genesee 

 shale of New York and Pennsylvania [abstract] ; by Amadeus 



W. Grabau 207 



American Diphyphylloid corals [abstract] ; by George H, Chad- 

 wick 208 



Criteria of attitude in bedded deposits [abstract] : by Lancaster 



D. Burling 20S 



Devonian of central Missouri; Fauna of the Cooper limestone 



[abstract] ; by Darling K. Greger 209 



Albertella fauna ; by Charles D. Walcott 209 



Some fundamental points in the classification of trilolntes : l)y 



Percy E. Raymond 209 



Section of Vertebrate Paleontology 209 



Session of Thursday, December 28 209 



Fossil mammals from Porto Rico [abstract] ; by H. E. Anthony.. 200 

 Second report of the connnittee on nomenclature of skull elements 



in Tetrapoda [abstract] ; by W. K. Gregory 210 



Session of Friday, December 29 210 



South Carolina mastodon [abstract] ; by F. B. Loomis 210 



Horned artiodactyl from the Tertiary of Nebraska [abstract J : by 



R. S. Lull 211 



Felidte of Rancho la Brea [abstract] : by J. C. Merriam 211 



" Gigantic megatherium from Florida [abstract] ; by W. D, Matthew 212 

 Skeleton of Diatryma, a gigantic bird of the Lower Eocene [ab- 

 stract] ; by W. D. Matthew and Walter Granger 212 



