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 variabilist^ewhQTry, Mon. U. S. Geol. Surv. 16, p. 165, plate 16, 

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



1906. Mi/lostoma variabile Eastman, Bull. Mus. Com. Zool., 50, p. 22, plate 1, 

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



Figure D. 



Mylostoma newberryi, 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 



