PLATE 18 



1 



1. Type specimen of Erpetosatirus scitlptilis Moodie, from the Cannelton Shales of Pennsyl- 



vania. Original in the University of Chicago, Walker Museum. 



2. Skeletal elements of Eryops sp. indet., from the Pittsburgh Red Shale at Pitcairn, 



Pennsylvania. a=nearly complete vertebra; b and r=ribs; </=pleurocentrum; 

 f=neural arch and spine. Originals in the Carnegie Museum at Pittsburgh. 

 After Case. 



3. Photograph of amphibian footprints, IlroiHopus adiinciis, Branson, from the Mississippian 



shales of Giles County, Virginia. XX- Courtesy of Dr. Branson. Original in the 

 Museum at Oberlin College. 



4. Photograph of type of Thinopns antiquus Marsh, the amphibian footprint from the 



Devonian of Pennsylvania. X %. Courtesy of Dr. Lull. Original No. 784, Vale 

 University Museum. 



