Downloaded from gsabulletin.gsapubs.org on April 10, 2015 BULLETIN Ot" TMfc GEOLOGICAL SOCIETY OF AMERICA V o l . 29 , p p . 119-166 M a r c h 3 1 , 19 18 PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY PROCEEDINGS OF THE NINTH ANNUAL MEETING OF THE PALEONTOLOGICAL SOCIETY, HELD AT PITTSBURGH, PENNSYLVANIA, DECEMBER 31, 1917, AND JANUARY 1 AND 2, 1918. R. S. Bassler, Secretary CONTENTS Page Session of Monday, December 31.......................................................................... 122 Report of the Council....................................................................................... 123 Secretary’s report........................................................................................ 123 Treasurer’s report....................................................................................... 124 Appointment of Auditing Committee............................................................ 125 Election of officers and members.................................................................. 125 Election of new members................................................................................ 126 Presentation of papers on paleontology and stratigraphy....................... 127 Paleozoic deposits and fossils on the Piedmont of Maryland and Virginia [abstract]; by R. S. Bassler.............................................. 127 Significance of the Sherburne bar in the Upper Devonic stratig­ raphy [abstract]; by Amadeus W. Grabau.................................... 127 Algal limestone on the Belcher Islands, Hudson Bay [abstract]; by E. S. Moore......................................................................................... 128 Symposium on problems in history of faunal and floral relationships in the Antillean-Isthmian region and their bearing on biologic rela­ tionships of North and South America................................................... 129 Relations between the Paleozoic floras of North and South Amer­ ica; by David White............................................................................ 129 Relations between the Mesozoic floras of North and South Amer­ ica; by F. H. Knowlton...................................................................... 129 Paleogeographic significance of the Cenozoic floras of equatorial America and the adJacent regions; by E. W. Berry. .. i.............. 129 Bearing of the distribution of the existing flora of Central Amer­ ica and the Antilles on former land connections; by William Trelease..;...............................................................................................129 Paleozoic history of Central America and the West Indies; by R. S. Bassler............................................................................................. 129 Presidential address by J. C. Merriam: An outline of progress in paleontologic research on the Pacific coast........................,.................. 129 Smoker to the Society...................................................................................... 130 X—Boll. Geol. Soc. Am., Vol. 29, 1917 (119) Downloaded from gsabulletin.gsapubs.org on April 10, 2015 120 PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY Page Session of Tuesday, January 1.............................................................................. 130 Some observations on the osteology of Diplodocus; by William J. Holland..................................................................................................... 130 Critical study of fossil leaves from the Dakota sandstone [ab­ stract] ; by B. M. Gress........................................................................ 131 Observations on the skeleton of Moropus cooki in the American Museum [abstract] ; by Henry Fairfield Osborn.............................. 131 A long-Jawed mastodon skeleton from South Dakota and phylog- eny of the Proboscidea ; by Henry Fairfield Osborn......................... 133 Continuation of symposium............................................................................. 138 Mesozoic history of Central America and the West Indies; by T. W. Stanton.......................................................................................... 138 Cenozoic history of Central America and the West Indies; by T. W. Vaughan........................................................................................ 138 Relationships of the Mesozoic reptiles of North and South Amer­ ica; by S. W. Williston........................................................................ 138 Affinities and origin of the Antillean mammals ; by W. D. Matthew 138 Fresh-water fish faunas of North and South America; by C. H. Eigenmann.................................................................................................138 Evidence of recent changes of level in Porto Rico, as shown by studies in the Ponce district; by Graham John Mitchell............ 138 Presentation of papers...................................................................................... 141 Generic nomenclature of the Proboscidea [abstract] ; by W. D. Matthew..................................................................................................... 141 ¡Session of Wednesday, January 2................................................... 141 Report of the Auditing Committee................................................................ 141 Presentation of papers...................................................................................... 142 Cretaceous overlaps in northwest Europe and their bearing on the bathymetric distribution of the Cretaceous Silicispongise [ab­ stract] ; by MarJorie O’Connell.......................................................... 142 New bathymetrical map of the West Indies region [abstract] ; by Chester A. Reeds..................................................................................... 142 Isolation as a factor in the development of Paleozoic faunas [ab­ stract] ; by Amadeus W. Grabau...................................................... 143 An Ordovician fauna from southeastern Alaska [abstract] ; by Edwin Kirk.............................................................................................. 143 Affinities and phylogeny of the extinct Camelidse [abstract] ; by W. D. Matthew........................................................................................ 144 Rocky Mountains section in the vicinity of Whitemans Pass [ab­ stract] ; by C. W. Drysdale and L. D. Burling.............................. 145 Further light on the earlier stratigraphy of the Canadian Cor­ dillera [abstract] ; by Lancaster D. Burling.................................. 145 Evolution of vertebrae; by S. W. Williston........................................ 146 Diseases of the Mosasaurs [abstract] ; by Roy L. Moodie..............147 Report on a collection of Oligocene plant fossils from Montana [abstract] ; by O. E. Jennings............................................................. 147 New Tillodont skull from the Huerfano Basin, Colorado [ab­ stract] ; by Walter Granger................................................................. 147 Downloaded from gsabulletin.gsapubs.org on April 10, 2015 CONTENTS 121 Page Mollusca of the Carrizo Creek beds and their Caribbean affinities [abstract]; by Roy E. Dickerson...................................................... 148 Proposed correlation of the Pacific and Atlantic Eocene [ab­ stract] ; by Roy E. Dickerson............................................................ 148 Paleozoic glaciation in southeastern Alaska [abstract]; by Edwin Kirk............................................................................................................. 149 Principles of classification of Cyclostome bryozoa [abstract]; by F. Canu and R. S. Bassler..................................................................151 Fauna of the Meganos group; by B. L. Clark.................................. 152 Fossil mammals of the Tiffany beds [abstract] ; by W. D. Matthew and Walter Granger............................................................................... 152 Fauna of the Idaho Tulare Pliocene of the Pacific Coast region; by J. C. Merriam.................................................................. ............... 152 Revision of the Pseudotapirs of the North American Eocene [ab­ stract]; by O. A. Peterson.................................................................. 152 Notes on the American Pliocene rhinoceroses [abstract]; by W. D. Matthew........................................................................................ 153 New artiodactyls from the Upper Eocene of the TJinta Basin, Utah [abstract]; by O. A. Peterson.................................................. 153 Marine Oligocene of the west coast of North America [abstract]; by B. L. Clark and Ralph Arnold.................................................... 153 The question of paleoecology; by F. E. Clements.............................. 154 Note on the evolution of the femoral trochanters in reptiles and mammals; by William H. Gregory.................................................... 154 Carboniferous species of “Zaphrentis”; by G. H. Chadwick..........154 Extinct vertebrate faunas from, the Badlands of Bautista Creek and San Timoteo Canyon of southern California; by Childs Frick........................................................................................................... 154 Notes on Eifel brachiopods; by G. H. Chadwick.............................. 154 Register of the Pittsburgh meeting,