224 



BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



of Professor Newberry. Its principal characters are summed up in the 

 following definition. 



Mylostoma newberryi, sp. nov. 



Fig. D. 



1889. Mylostoma variabilis Newberry, Mon. U. S. Geol. Surv. 16, p. 165, plate 16, 

 fig. 4 (non figs. 1-3). 



1906. Mylostoma variabile Eastman, Bull. Mus. Com. Zool., 50, p. 22, plate 1, 

 fig. 7 (non figs. 1-5, 8-9). 



Figure D. 



Mylostoma neioberryi, sp. nov. Cleveland shale ; near Sheffield, Ohio. Above, the original 

 pair of Newberry's so-called " premandibular teeth," here interpreted as mandibular 

 (Oberlin Museum Cat. 1302). Below, a smaller left mandibular plate (Museum of 

 Comparative Zoology Cat. 1439). X \. 



An imperfectly known species, established upon the evidence of mandibular 

 dental plates which have become accidentally dissociated from their supporting 



