208 PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



FEW AlORE FACT* BEARING ON THE CORRELATION OF THE CHESTER 



FORMATIONS 



BY E. O. XLRICH 



A paleobotanical subject followed, illustrated by lantern slides, which 

 showed the elearness and detail that can lie obtained in thin sections of 

 fossil plants. 



OCCURRENCE OF THE PARICHNOS OF BERTRAM) IN CERTAIN GYMNOSPERMS 



BY E. C. JEFFREY 



(Abstract) 



The structure of Parichnos is well known for Lepidodcndron and Sigillaria. 

 The author has found similar structures in certain living gymnosperms. They 

 accompany the leaf-traces from the surface of the central cylinder out to the 

 base of the leaf, where they end in the spongy central green substance of the 

 leaf. Sometimes the Parichnos of gymnosperms appear as canals and some- 

 times merely as strands of richly aeriferous parenchyma. Their significance 

 from the physiological and morphological standpoints is discussed, as well as 

 the possibility of their indicating relationship between the gyinnosperins in 

 which they are found and the Lepidophyta. 



The final paper presented at the meeting was an interesting discussion 

 given by the author. 



AGE AND DEVELOPMENT OF RED BEDS AXD THE TERRESTRIAL VERTE- 

 BRATES IX THE APPALACHIAN AXD THE KAXSAS-TEXAS REGIOX 



BY J. W. BEEDE 



(Abstract) 



1. Review of postulate regarding uneven development of Red Beds and Per- 

 mian terrestrial vertebrates of the Appalachian and Western Plains provinces 

 of the United States. 



2. Review of development of marine invertebrates and plants in these re- 

 gions during Pennsylvanian and Permian times, which show relatively little 

 progress during upper Pennsylvanian time and a marked quickening of the 

 evolutionary processes at the beginning of Permian time. 



3. Review of the history of the vertebrate life during this time, and the 

 conclusion that it. too, has, so far as known, relatively little expansion during 

 the upper Pennsylvanian, with marked expansion, specialization, and change 

 of fundamental aspect beginning at the base of the Permian and continuing 

 at least until the close of the Clear Fork epoch of the Permian. 



4. Demonstration of the accumulation of Red Beds deposits earlier in the 

 Pennsylvanian period in the Wichita Mountain region than any now preserved 

 in the rocks of the Pennsylvanian period of Ohio. West Virginia, and Penn- 

 svlvania. 



