CONTENTS Vll 



rage 

 Symposium on problems in history of faunal and floral relation- 

 ships in the Antillean-Isthmian region and their bearing on bi- 

 ologic relationships of North and South America 129 



Relations between the Paleozoic floras of North and South 



America ; by David White ]20 



Relations between the Mesozoic floras of North and South 



America ; by F. H. Knowlton 120 



Paleogeographic significance of the Cenozoic floras of equa- 

 torial America and the adjacent regions; by E. W. Berry. . 120 

 Rearing of the distribution of the existing flora of Central 

 America and the Antilles on former land connections ; by 



William Trelease 120 



Paleozoic history of Central America and the West Indies ; by 



R. S. Bassler 120 



Presidential address by J. C. Merriam : An outline of progress in 



paleontologic research on the Pacific coast 129 



Smoker to the Society 130 



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 E. M. Gress 131 



Observations on the skeleton of Moropus cooki in the Amer- 

 ican museum [abstract] ; by Henry Fairfield Osborn 131 



A long-jawed mastodon skeleton from South Dakota and phy- 

 logeny 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 



America ; by S. W. Williston 138 



Aflinities 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 



Evidences 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 th«ir bearing on 

 the bathymetric distribution of the Cretaceous Silicispongiie 

 [abstract] ; by Marjorie O'Connell 142 



