48 CATALOG OF FOSSIL FISHES IN THE MUSEUM 



The following specimens are referred — some positively, others only 

 tentatively — to this species. All are from the Conodont bed (Gene- 

 see), at Eighteen Mile Creek, Erie County, N. Y., and were collected 

 by W. L. Bryant, 



E 2382 Functional half of a left mandible lacking the inferior mar- 

 gin; in matrix, shown in outer view (PI. lo, fig. 2). The 

 beak is elongated, and back of it there is a smooth, un- 

 toothed cutting edge. The front portion of this cutting 

 edge has lost its beveled margin, while the posterior half 

 has not; this produces the illusory appearance of a cusp 

 situated far back on the cutting margin. The full length' 

 of the cutting margin is preserved, the break occurring at 

 the beginning of the blade portion. The specimen seems 

 to have been about the size of the type mandible, and as 

 far as preserved agrees with it in character (cf. fig. 13). 

 We think there is no doubt that it is referable to Dinichthys 

 newberryi. 



Measurements mm. 



Total width of functional region, including beak 116 



Height of beak (measured on a perpendicular) 40 



Width of beak at its base S3 



Length of cutting margin (exclusive of beak) 83 



E 1939 A left antero-superognathal (PL 11, figs, i, la, and text-fig. 

 15) of about the size to go with the mandible described in 

 the preceding paragraph. This and the following exam- 

 ples of upper dental plates almost positively belong to this 

 species. The element is easily distinguished from other 

 antero-superognathals; first, by the broader and much 

 thinner articulating process, which is very different from 

 the thick process, broadly elliptical in cross-section, seen 

 in D. terrelli and related forms; second, by the median 

 lateral portion of the tooth (the opposite side to that of 

 the process) not being so much in-roUed as in the Ohio 

 species. 



Measurements mm. 



Total height (point of tooth restored) 93 



Total width 65 



Width of process 31 



Length of tooth portion (estimated) _. 45 



