6o NEW YORK STATE MUSEUM 



Diplodus striatus Eastman 



Plate I, figures lo, it 



1899 Diplodus striatus C. R. Eastman. Jour. Geol. 7 : 490, pi. 7, fig. 3, 4 



1899 D i p 1 o d us striatus S. Weller. Jour. Geol. 7 : 484 



Of this species only a few fragmentary specimens were obtained by Dr 

 Weller from the same locality as the last, the largest and most perfect 

 being represented in plate i, figure 10. It attains apparently about 

 twice the size of the preceding form, and is distinguished from it by its 

 finer striation, shallower root, and somewhat compressed section of its 

 principal cones. The striae on the anterior face all curve uniformly in 

 a spiral direction, but on the posterior face the tendency is to curve out- 

 ward on either side of the median line to the lateral margin of the cones, 

 where they terminate, exactly as in some species of Cladodus. None of 

 the specimens show the full length of the median denticle, but it was 

 apparently long and slender. 



Formation and locality. Upper Devonic ; Elmhurst, 111. 



Genus PHOEBODUS .St John & Worthen 

 Teeth differing from those of Diplodus in having three principal cones 

 of about equal size, and from one to three very small intermediate cones. 



Phoebodus politus Newberry 



Pl.ite I, figure xl 



1889 Phoebodus politus /. S. N'eivhcrry. U. S. Geol. Sur. Monogr. 16:173, 

 pi. 27, fig. 27-28a 



1899 Phoebodus politus C. R. Eastman. Jour. Geol. 7: 491, pi. 7, fig. 5 



Newberry's original description of this rare and interesting form is as 

 follows : 



Teeth small, robust, breadth between tips of lateral cusps 6 to i 2 mm, 

 hight from 4 to 8 mm, base broadly elliptical, thick, with a broad bilobed, 

 padlike prominence m the middle portion of the upper surface, concave 

 below, with a narrow arch between the cusps ; cusps three, of nearly equal 

 size, with minute rudimentary ones in the angles between them, all strongly 

 recurved, flattened in front with salient, acute angles, rounded behind ; 

 surface smooth and polished, or bearing a few short, coarse striations. 



