76 NEW PALEOZOIC VEKTEBKATA. [Feb. 5, 



from the Carbonic system of Ohio and Illinois by Newberry, viz.: 

 S. occidentalis and S. reiiculatiis from the concretions of the Coal 

 Measures of Mazon Creek, Illinois, and S. quadratus from the Coal 

 Measures of Linton, Ohio. The collection of Mr. Lacoe contains 

 twenty-two scales with their reverses in clay concretions from Mazon 

 Creek, and I have recognized the two species described by New- 

 berry from this locality in nine of them. The remaining thirteen 

 belong to several other species which differ widely in the size, form, 

 and sculpture of the scales, no less than six species being apparently 

 represented. Within the limits of these there is considerable varia- 

 tion, largely dependent on the part of the body from which the 

 scale has been derived. They all present a more or less reticulate 

 or tessellate structure, and a sculpture of very fine, closely placed 

 lines, which radiate to the free border, the latter sometimes forming 

 the only sculpture near the latter. This tessellate structure resem- 

 bles that of the existing genus Osteoglossum, and its Eocene repre- 

 sentative Dapedoglossus Cope. Dr. A. S. Woodward refers ( Catal. 

 Fishes B. M.) Newberry's species to the Dipnoans genus Sageno- 

 dus, and the species described below may be ultimately so referred. 

 However, no teeth of Dipnoans have been found thus far in the 

 Mazon Creek beds, while scales are abundant. The reference then 

 remains uncertain, and the species should be determined for iden- 

 tification of the bed at other localities. 



The species of the Lacoe collection differ as follows : 



I. Concentric lines conspicuous ; tessellation and radii not con- 

 spicuous. 



Scales medium to large ; subround S. occidentalis Newb. 



II. Concentric lines fewer, marginal ; tesselation conspicuous, 

 radiating from a center. 

 Scales medium to large, acuminate distad ; tessellation very fine. . . 



S. foliaius, sp. nov. 

 Scales small to medium, elongate, subacuminate ; tessellation elon- 

 gate without regular radii or concentric ridges ; center at 



extremity S. reticulatiis Newb. 



Scales medium to large, parallelogrammic ; tessellation radiating, 

 radii and concentric ridges extending to free edge ; center at 



end S. conchiopsis, sp. nov. 



Scales very large, elongate, tessellation confined to center, from which 

 . issue numerous well-spaced radii , ^. lacovianus, sp. nov. 



