1897.] NEW PALEOZOIC VERTEBRATA. 77 



Scales medium, truncate ; tessellation coarse, diamond-shaped, 



quincuncial -5". quinciinciatus, sp. nov. 



Scales medium, truncate ; tessellation coarser parallelogrammic .... 



S. broivnicB, sp. nov. 



III. No concentric lines or center ; a border of fine radii. 

 Very large, elongate, tessellation very fine .... .5". magister, sp. nov. 



IV. No concentric lines or radii ; tessellation extending to pos- 

 terior border. 



Scales deep, smaller ; center submedian ; tessellation of medium 

 coarseness S. gicrleianus, sp. nov. 



Of the S. occide?iialis there are three scales (Figs. 1-2, 19-20- 

 99), which agree well with the descriptions of Newberry. They 

 evidently belong to a large species very distinct from the others 

 here enumerated. I have not identified the S. quadratics Newb. 

 found at Linton, O., in the Mazon Creek specimens. One scale 

 presents a broadly truncate posterior margin, and it is even slightly 

 concave. The size is rather large, appropriately to the S. quadratus, 

 and the sculpture is strongly marked. I suspect that it is a scale 

 from near the shoulder-girdle, and of entirely exceptional form. 

 Newberry's type is incompletely preserved and described, and it 

 will be necessary to secure other specimens from Linton in order 

 for its full characterization. 



Sagenodus foliatus, sp. nov. PI. I, Fig. i. 



Founded on two scales in excellent preservation. These differ 



from those of all the other species here described in their elongate 



oval form, with subacuminate distal border. The proximal border 



is strongly convex. The sculpture consists, first, of a wide border 



of very fine radii, crossed by rather distant concentric lines ; 



second, of a narrower band of coarser but rather close radii ; and 



thirdly, of a rather large area of fine reticulations, of which the 



center marks the proximal fourth of the length of the scale. The 



marginal band is marked by a reticulation much coarser than that of 



the center. 



Measuremenis. mm. 



Diameters of scale ^1 , . '." ' * 



( longitudinal 39 



Three tesserae of area i 



Width of marginal band 6.5 



Type No. F. 9 and 10, Lacoe's collection ; Cotypes F. 53, 54. 



