Eastman. — Mylostoma. 



EXPLANATION OF PLATES. 



PLATE 1. 



Upper Dentition of Mylostomids. 



All specimens are shown of the natural size. Those of Mylostoma are from the 

 Cleveland shale (Upper Devonian) of Sheffield, Ohio. 

 Fig. 1. Right anterior palato-pterygoid dental plate of Mylostoma variabile Newb. 



Type specimen figured in Plate 13, Fig. 4 of Newberry's Monograph, 



1889. Original preserved in American Museum of Natural History 



(Cat. No. 43 G). 

 Fig. 2. Left anterior palato-pterygoid dental plate of Mylostoma variabile Newb. 



Type specimen figured in Plate 15, Fig. 4 of Newberry's Monograph, 



1889. Original preserved in the Museum of Comparative Zoology 



(Cat. No. 1435). 

 Fig. 3. Left anterior palato-pterygoid dental plate of Mylostoma variabile Newb. 



Type specimen figured in Plate 13, Fig. 3 of Newberry's Monograph, 



1889. Original preserved in American Museum of Natural History 



(Cat. No. 42 G). 

 Figs. 4, 5. Right and left vomerine teeth of Dinomylostoma beecheri Eastman, seen. 



from the anterior external aspect. Type in Peabody Museum, Yale 



University. From the Portage beds of Mt. Morris, N. Y. 

 Fig. 6. Left posterior palato-pterygoid dental plate of Mylostoma variabile Newb. 



This plate belongs to the small, probably immature, individual described 



by Dean in the Memoirs N. Y. Acad. Sci. for 1901. Original preserved 



in the American Museum of Natural History ; counterpart in the 



Museum of Comparative Zoology. 

 Fig. 7. Vomerine tooth of Mylostoma variabile Newb. Original in Museum of 



Comparative Zoology (Cat. No. 1439). 

 Fig. 8. Eight posterior palato-pterygoid dental plate of Mylostoma variabile Newb. 



Original preserved in American Museum of Natural History (Cat. No. 



3591). 

 Fig. 9. Left posterior palato-pterygoid dental plate of Mylostoma variabile Newb. 



Original preserved in the Museum of Comparative Zoology (Cat. No. 



1437). 



