EASTMAN: CARBONIFEROUS FISHES FROM THE CENTRAL WEST. 181 
Platyxystrodus occidentalis (St. Jouy). 
1870. Xystrodus (?) occidentalis O. H. St. John, Proc. Amer. Phil. Soc., Vol. XL, 
p. 436. 
1872. Xystrodus (?) occidentalis O. H. St. John, Hayden’s Final Rept. U.S. Geol. 
Surv. Nebraska, p. 244, Pl. IV., Fig. 18. 
This species is founded upon a single imperfect tooth, doubtfully of this 
genus, from the Missourian of Aspinwall, Nebraska. The general form is 
suggestive of Deltodus, but the coronal surface is described by St. John as 
exhibiting the characteristic punctations of Platyxystrodus. 
Deltodus angularis Newserry and WorruHen. 
(Plate 2, Fig. 19.) 
1866. Deltodus angularis Newberry and Worthen, Pal. Illinois, Vol. IL., p. 97, Pl. 
IX.,, Fig. 1. 
1870. Deltodus (?) angularis O. H. St. John, Proc. Amer. Phil. Soc., Vol. XL. p. 437. 
1872. Deltodus (?) angularis O. H. St. John, Hayden’s Final Rept. U. S. Geol. 
Surv. Nebraska, p. 244, Pl. VI, Fig. 18. 
1883. Orthopleurodus carbonarius St. John and Worthen, Pal. Illinois, Vol. VIL, 
p. 192, Pl. XIII., Fig. 7 (non Figs. 6, 8). 
The forms cited in the above synonymy all plainly belong to the genus 
Deltodus, and hence we find ourselves unable to agree with St. John and 
Worthen in their proposed union of this species with Sandalodus, on the basis 
of three fortuitously associated teeth described by them in Volume VII. of the 
Illinois Palaeontology. A small posterior dental plate was obtained by St. 
John from the Missourian of Nebraska City, and the larger one shown in Plate 
2, Fig. 19, is from the same horizon near Louisville, Nebraska. 
Formation and Locality. — Missourian; Kansas, Nebraska, lowa, and Mis- 
souri. Lower Coal Measures; Illinois and Indiana. 
Sandalodus carbonarius Newserry and WorTHEN. 
1866. Sandalodus carbonarius Newberry and Worthen, Pal. Illinois, Vol. II., p. 104, 
Pl. X., Figs. 4, 5. 
1883. Orthopleurodus carbonarius St.John and Worthen. Op. cit., Vol. VIL., p. 192, 
Ply FigsiG; 8) 
1889. Orthopleurodus carbonarius J. P. Lesley, Rept. Geol. Surv. Penn., Vol. IL., 
pp. 568, 920, Pl. 4. 
1895. Orthopleurodus carbonarius J. P. Lesley, Summary Geol. Penn., Vol. III., 
Pl. LXXI. 
Examples of this species determined by St. John and Worthen as ‘“ long 
posterior teeth of the upper jaw” are reported by these authors from the 
“Upper Coal Measure strata near Topeka, Kansas.” 
