CONTENTS V 



Page 



Announcement as to presentation of papers 105 



Alpheus Hyatt and his principles of research [abstract] ; by 

 Robert T. Jackson 105 



Restoration of Tertiary fossils [abstract] ; by William B. Scott. 105 



Paleozoic Arachnida — scorpions and spiders [abstract] ; by Alex- 

 ander Petrunkevitch 106 



Presidential address , 106 



Preliminary discussion of the stratigraphy and age of the Pyro- 

 therium beds of Patagonia [abstract] ; by Frederick B. Loomis. 107 



Organization of a Section on Vertebrate Paleontology 107 



The cataract; a new formation at the base of the Siluric in On- 

 tario and New York [abstract] ; by Charles Schuchert 107 



The Medina problem [abstract] ; by E. O. Ulrich 107 



Session of Tuesday, December 31 108 



Paleontological notes : 1. Polyphyletic genera. 2. An illustration 

 of Waagen's theory of mutations [abstract] ; by A. W. Grabau. 109 



Nomenclature, structure, and classification of the Cremacrinidae 

 [abstract] ; by E. O. Ulrich 109 



Richmond formations of the provinces of Ontario and Quebec in 

 Canada [abstract] ; by A. F. Foerste 110 



Crinoid genus Scyphocrinus and its bulbous root Camarocrinus 

 [abstract] ; by Frank Springer 110 



Correlation of the Middle Ordovician formations of Ontario and 

 Quebec [abstract] ; by P. E. Raymond Ill 



The Alexandrian series in Missouri and Illinois — stratigraphy and 

 paleontology, Part I [abstract] ; by T. E. Savage Ill 



Notes on the origin of certain Upper Cambrian and Lower Ordo- 

 vician sediments of Center County, Pennsylvania [abstract] ; by 

 Thomas C. Brown 112 



Spiriferoids of the Lake Minnewanka section, Alberta [abstract] ; 

 by H. W. Shimer 112 



Contributions to the black shale problem [abstract] ; by Charles 

 Butts H^ 



Papers on paleobotany H^ 



Paleobotanical study of the coal-bearing rocks of the Raton Mesa 

 region of Colorado and New Mexico [abstract] ; by F. H. 

 Knowlton 114 



Status of the study of the fossil floras of the Atlantic Coastal 

 plain [abstract] ; by Edward W. Berry 114 



Roots in the underclays of coals [abstract] ; by David White. ... 114 



Coralline algse in an Ordovician dolomite [abstract]; by Buot 



-II!-. 



Blackwelder ' 



Note on a process of fossilization in the Baleoaolc lyeopods I ab- 

 stract] ; by E. M. Kindle 11C 



Preliminary correlation of the Cretaceous ami Tertiary Bores of 



Alaska [abstract] ; by Arthur IIoi.i.h k 116 



Minutes of sectional meeting of vertebrate paleontology in 



Relationship of the Tupadida and <>r Eocene tenure, especially 

 Notharctw [abstract] ; by W. K. Greoobx Ill 



