CONTENTS Vll 



Page 

 Brecciation effects in the Saint Louis limestone [abstract] ; 



by Francis M. Van Tuyl 122 



Vote of thanks 124 



Register of the Washington meeting, 1915 125 



Officers, Correspondents, and Fellows of the Geological Society of 



America 127 



Proceedings of the Seventh Annual Meeting of the Paleontological Society, 

 held at Washington, District of Columbia, December 29, 30, and 31, 1915 ; 



It. S. Bassler, Secretary 139 



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 Ru- 

 dolph RUEDEMANN 146 



Importance of "coral reefs" and reef deposits in the forma- 

 tion 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 Neumayr, Mu- 

 tants of De Aeries : Relations of these phenomena in evolu- 

 tion [title] ; by Henry Fairfield Osborn 148 



Systematic rank of mutations and submutations in orthoge- 

 netic series among the invertebrates [abstract] ; by Ama- 

 deus W. Grabau 148 



Classification of the Tetraseptata, with some remarks on par- 

 allelism in development in this group : A study in ortho- 

 genesis [abstract] ; by Amadeus W. Grabau 14S 



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

 Presidential address by E. O. TJlrich : The use of fossils in corre- 

 lation 149 



Section of Vertebrate Paleontology 149 



Phylogenetic review of extinct and recent anthropoids, with 

 special reference to the evolution of the human dentition 

 [abstract] ; by W. K. Gregory 149 



Additional characters of Tyrannosaurus and Ornithomimus 

 [abstract] ; by Henry Fairfield Osborn 150 



Criteria for the determination of species in the Sauropods. 

 with description of a new species of Apatosaurus [ab- 

 stract] ; by Charles C. Mook 151 



Pelvis and sacrum of Caniarasaurus [abstract] ; by Henry 

 Fairfield Osborn 151 



