PLATE 2B /Jo 



Photograph of type specimen of Erpetosaitrus {TiicHtanus) radiatus Cope, from the Coal Measures of 



Linton, Ohio. X 1.3. Original in American Museum of Natural History. 

 Photograph of type specimen of ^>7>fto.!a«r?<i /aA»</(j/?/.s Cope, from the Coal Measures of Linton, 



Ohio. X 2. Original in the Zoological Collections of Columbia University. 

 Photograph of the impression of Stegops divaricata Cope, from the Coal Measures of Linton, Ohio, 



X 2. The specimen figured is in the American Museum of Natural History. Its obverse is in 



the collections at Walker Museum, University of Chicago. 

 Type and only known specimen of Micrerpeton caudatutn Moodie, a branchiosaur from the Coal 



Measures shales of Mazon Creek, Illinois. X 2. Original in collections at Walker Museum, 



University of Chicago. 



