BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 27, pp. 139-174 March 31, 1916 



proceedings of the paleontological society 



PROCEEDINGS OF THE SEVENTH ANNUAL MEETING OP 

 THE PALEONTOLOGICAL SOCIETY, HELD AT WASH- 

 INGTON, DISTEICT OP COLUMBIA, DECEMBEE 29, 30, 

 AND 31, 1915. 



R. S. Bassler, Secretary 



CONTENTS 



Page 



Session of Wednesday, December 29 142 



Report of the Council 142 



Secretary's report 142 



Treasurer's report 143 



Appointment of Auditing Committee 144 



Election of officers and members 144 



Election of new members 145 



Memorial of Orville A. Derby 146 



Announcements 146 



Presentation of general papers 146 



Presence of a median eye in trilobites [abstract] ; by Rudolph 



Ruedemann 146 



Importance of "coral reefs" and reef deposits in the formation of 



Paleozoic limestone [abstract] ; by Thomas C. Brown 147 



Distribution and inferred migration of American Middle and 



Upper Devonic corals [abstract] ; by Amadeus W. Grabau 147 



Mutations of Waagen, Mutationsrichtung of Nenmayr, Mutants of 

 De Vries : Relations of these phenomena in evolution [title] ; 



by Henry Fairfield Osborn 148 



Systematic rank of mutations and submutations in orthogenetic 

 series among the invertebrates [abstract] ; by Amadeus W. 



Grabau 148 



Classification of the Tetraseptata, with some remarks on parallel- 

 ism in development in this group : A study in orthogenesis [ab- 

 stract] ; by Amadeus W. Grabau 148 



Guelph formation of Ontario [abstract] ; by M. T. Williams 148 



Presidential address by E. O. Ulrich ; The use of fossils in correlation . 149 



Section of Vertebrate Paleontology 149 



Phylogenetic review of extinct and recent anthropoids, with spe- 

 cial reference to the evolution of the human dentition [ab- 

 stract] ; by W. K. Gregory 149 



(139) 



