120 CATALOG OP FOSSIL FISHES IN THE MUSEUM 



Front half of functional margin, in profile view, gently excavated; 

 hinder half almost straight and rising gently to the posterior 

 extremity. Posterior part of tritor narrow. [Front portion not 

 preserved.] 



Remarks. — This gracefully formed dental plate is readily dis- 

 tinguished from the other three species of Palceomylus by its outline. 

 Its front margin rises more abruptly upward than in the other species, 

 and the plate as a whole, disregarding the posterior angle, is relatively 

 deeper in proportion to its length. The difference in outline between 

 this plate and the other three species is clearly brought out in fig. 42, 



Fig. 41. Palaomylus lunaformis, n. sp. Outline of Type Dental Plate, 

 Shown est Plate 40, Figure 6. Natural Size. E. 1928 



The foUowing specimen which is larger than the type, perhaps also 

 belongs to this species. 



E 2445 A large imperfect dental plate measuring 13.5 cm. in length 

 as far as preserved. It shows the greater portion of the 

 tritoral area and a part of the outer and inner walls of the 

 element. The tritor is 1.5 cm. at its widest point, and 

 narrows anterior-ward to a sharp edge. Its surface is 

 worn, but it shows no linear arrangement of punctse. 



Conodont bed (Genesee); Eighteen Mile Creek, near 

 North Evans, Erie County, N. Y. Collected by W. L. 

 Bryant. 



