BUFPALO SOCIETY OF NATURAL SCIENCES 45 



and this points to the specimen belonging to D. mag- 

 nificus. Only the proximal portion of the articulating 

 process is preserved. 



E 1942 A rather small left postero-superognathal, perfect except 

 for the absence of the articulating process (PL 9, figs, i, 2) 

 Length, 89 mm.; maximum width, 41. 



This specimen was found unassociated with other 

 plates. Our reason for referring it to this species is the 

 same as that for the preceding specimens, namely, the 

 fact that the worn edge shows that the secondary cusp 

 of the opposing mandible was situated far back, as in 

 D. magnificus* The element resembles E 1937 as far as 

 the preservation of the latter allows of comparison, but 

 it is only about two-thirds its size. 



Dinichthys newberryi Clarke 

 (Pis. 10, 11; text-figs. 13, 14) 



This species was originally based' ^ on a right mandible, a postero- 

 superognathal and fragmentary cranial plates, all contained in a con- 

 cretion from the Styliola layer of the Genesee, at Bristol Center, 

 N. Y. A dorsomedian plate found at another locality, but in the same 

 horizon, was also referred to by Clarke as probably belonging to 

 this species. 



The type, which is preserved in the United States National Museum, 

 was kindly lent us recently for comparison with the material in the 

 Buffalo museum. Since it has never been figured in its entirety, only 

 the mandible having been illustrated by Clarke, and subsequently by 

 Eastman,^^ we deem it desirable to present an outline figure of it here 

 (fig. 13). From this it is seen that there are present in the type speci- 

 men the right mandible (Mnd), the left postero-superognathal (t'SG), 

 a section, apparently of one of the antero-superognathals (ASG), a 

 segment of a sclerotic ring (Scl) and an indeterminate plate (X) . It is 

 important to note also that a fragmentary plate displayed on the 

 under side of the same concretion, proves that the plates of this 

 species are not, as stated by Eastman,'^ smooth and unomamented, 



"Clarke, John M.; Bull. 16, U. S. Geol. Surv., 1885, p. 17, pl- 

 ^^ Mem. 10, N. Y. State Mus., 1908, pl. 6, fig. 2. 

 " Loc. cit, p. 133. 



