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1. I'htiton'i'aph of type specimen of fci-pt-tosam-iis (TiiJilaiiiis) ><:,/ia/i^ I'ope, from the Coal Measures of 



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



2. Photograph of type specimen of Erpetosaunis tabii/a/iis Cope, from the Coal Measures of Linton, 



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



3. Photograph of the impression of Stegops dirariiata 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. 



4. Type and only known specimen of Micrfrpfton caudal itm Moodie, a branchiosaui from the Coal 



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

 University of Chicago. 



