IS^OTE 



ON THE 



EURYPTERID^ 



OF THE 



DEVONIAN AND CARBONIFEROUS FORMATIONS 



OF PENNSYLVANT.l. 



By James Hall. 



In April, 1877, Mr. Charles E. Hall, of the staff of the 

 Second Geological Survey of Pennsylvania, commnnicated 

 to the American Philosophical Society the description of a 

 species of Eurypterus, {E. Pennsylvanicus,)trom. the Lower 

 Carboniferous rocks of Venango county, and another one 

 from the coal measures of Cannelton, Pennsylvania, under 

 the name of Eurypterus {DoUcltopterus) Mansfieldi, from 

 the collection of Hon. I. F. Mansfield. The length of rlie 

 latter specimen described, without the terminal joint, was 

 two and three-fourths inches. 



In April, 1881, Mr. Mansfield communicated to the Philo- 

 sophical Society "a drawing of a fine fossil Kui'vptPi'us, 

 found by him in the shale immediately beneath ih»' l):ii- 

 lington cannel coal bed, lower ])rodu('tive co:il me:isuies." 

 This specimen has an entire length of nine inches, of wiiicli 

 the telson constitutes about three inclies. At a later i)eriod 

 Mr. Mansfield X)hicpd his collection of these fossils in tiie 

 hands of Professor Lesley to be described and ilhistrated in 

 the publications of the Geological Survey. Mr. C. E. Hall 



(23 PPP.) 



