ABSTRACTS OF PAPERS PRESENTED 115 



boniferous age, clearly indicates that in most areas, at least, the coal swamps 

 were not too deeply submerged or inundated to permit vascular plants to root 

 and grow in place at the commencement of the formation of the mother peat. 

 In some cases evidence points also to the growth of arborescent vegetation on 

 the surface of the growing peat. Such growth unquestionably occurred on 

 the partings of certain coals and was not infrequent in the roofs of the sub- 

 merged peats. 



The following paper was presented without notes by the author and 

 illustrated by lantern slides; 10 minutes. Discussed by A. W. 

 Grabau. 



CORALLINE ALQ2E IN AN ORDOVICIAN DOLOMITE 

 BY ELIOT BLACKWELDER 



(Abstract) 



The Bighorn and Jefferson dolomites of western Wyoming consist very 

 largely of tangled upright growths, the exact nature of which is unsettled. A 

 study of the individual stalks, their mutual relations, and their internal struc- 

 ture brings out some suggestive resemblances between these problematic fossils 

 and certain modern coralline algae. 



The remaining papers, with one exception, were read by title: 



ORIGIN OF THE LIASSIC FLORA OF THE MIXTECA ALTA 

 BY G. B. WIELAND 



WOOD STRUCTURE OF THE CYCADEOIDEjE (WITH DEMONSTRATION) 



BY G. R. WIELAND 



FLORAL FEATURES OF THE CYCADEOIDE2E (WITH DEMONSTRATIONS) 



BY G. R. WIELAND 



EXHIBITION OF POLISH HI) SPECIMENS OF OZARhlW STROM ATOPOROIDS 

 FROM PENNSYLVAXIA 



BY G. R. WIELAND 



Presented without notes and illustrated by specimens and sketches; 

 5 minutes. 



NOTE ON A PROCESS OF F088ILIZATI0N l\ THE PALEOZOIC LTOOPODB 



BY E. M. KINDLE 



{Abstract ) 



Striking examples of a type of fossllizatlon In which the bark Is preserved 

 in exquisite detail, while the space within the bark is wholly filled with One 

 siliceous sediments, showing do trace of the original planl structure, occur 



