CONTENTS. 



Pages 



Editorial 1-7 



I. The Crayfish of Allegheny County, Pennsylvania. 



By E. B. Williamson 8-13 



II. A Preliminary List of the Vascular Flora of Alle- 

 gheny County. By John A. Shafer . . . 14-127 



III. Some New and Little Known Fossil Vertebrates. 



By John B. Hatcher 128-144 



IV, The Reptiles of Allegheny County, Pennsylvania. 



By D. A. Atkinson 145-157 



V. Osteology of the Herodiones. By R. W. Shufeldt 158-249 

 (Plates I-V) 



