82 • NEW PALEOZOIC VERTEBRATA. [Feb. 5, 



■extend to the margin. There are coarse radii at the proximal mar- 

 gin in the type ; in the other this edge is broken away. In both 

 there is a very coarse areation along the long borders. 



Measurements. mm. 



Diameters of type I ^^'•"<=^' 3^ 



C longitudinal 60 



Diameters of areas from 5 to i 



Diameters of F. 7 ( ^'=«''==^' 36 • 



C longitudinal 62 



Type No. F. 5, 6; Cotype F. 7, S. 



Sagenodus gurleianus, sp. nov. PL I, Fig. 9. 



This peculiar species is represented by a single scale. It is at 

 least as deep as long, and the entire surface is covered with reticu- 

 lations. The character of the sculpture is such that I cannot orient 

 the borders of the scale. Its general outline is that of a very 

 obtuse-angled equilateral spherical triangle. Along one of the bor- 

 ders the areation is more minute than along the other two, where 

 it is rather coarse. In a large central tract the areation is interme- 

 diate, but as it is centrally placed, it does not aid in the orienta- 

 tion of the scale, as to the anterior and posterior borders ; while 

 the disposition of the areas indicates which is the vertical, and 

 which the longitudinal diameter. There are apparently none of 

 the fine longitudinal striae usual in this genus, and there are a few 

 concentric ones near the margin with coarse areas. The areolar 

 septa are not regular except a few which are subradial to one of the 

 subhorizontal margins. 



Measurements. mm. 



-p.. , r 1 (vertical 18 



Diameters of scale . . . . A 



(transverse 17.5 



Coarser areas , 75 



Finer areas 2 



Type F. 21, 22. Lacoe collection. 



This species is dedicated to Mr. W. F. C. Gurley, State Geolo- 

 gist of Illinois, to whom I am under much obligation for the oppor- 

 tunity of examining important material. 



