122 CATALOG OP FOSSIL FISHES IN THE MUSEUM 



Palaeomylus sp. 



(PL 41) 



Besides PalcBomylus lunaformis there is a species resembling P. 

 greenei in the Conodont bed at Eighteen Mile Creek; but none of the 

 specimens of it so far obtained is perfect enough to show whether it is 

 this species or a distinct form. It is extremely Chimaeroid-like in 

 appearance, the dental plates in oral view being almost exactly like 

 those of Edaphodon from the Cretaceous of New Jersey. The anterior 

 extremity rises into a short beak, and the oral margin has two large 

 tritors, an anterior one situated close to the inner margin, and a pos- 

 terior one near the outer margin. The symphyseal area is very broad, 

 extending inward as far as the first tritor, from which point it descends 

 in a sharp line. 



It is to be hoped that complete elements of this interesting species 

 may be found, for they will, no doubt, add considerably to our present 

 knowledge of the genus PalcBomylus.- 



The following specimens are all from the Conodont bed (Genesee), 

 at Eighteen Mile Creek, near North Evans, Erie County, N. Y.; 

 collected by W. L. Bryant. 



E 2446 Right lower dental plate (PI. 41, figs, i, 2). The oral mar- 

 gin is preserved from the beak to a distance 2 or 3 cm. 

 behind the second tritor, and shows well the structure of 

 these parts. The beak, under a lens, shows tritoral 

 columns rising to the surface. In the second tritor, the 

 worn surface is much convoluted by narrow, line-like ridges 

 arranged in curves and circles. Length, as far as pre- 

 served, measured along oral margin, 9 cm. ; width of oral 

 margin immediately in front of first tritor, 25 mm.; tip 

 of beak to origin of first tritor, 31 mm.; anterior margin 

 of first tritor to origin of second, 24 mm, ; width of sym- 

 physeal area, 27 mm. 



E 2453 Beak of a left lower dental plate belonging to a specimen of 

 about the same size as the preceding. (PL 41, figs, i, 2, 

 part.) 



E 1929 and E 1930 Fragments of three dental plates showing por- 

 tions of the oral surface and the second tritor. (PL 41, 

 figs. 3-5.) 



