168 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
1872. Diplodus compressus O. St. John, Hayden’s Final Rept. U. S. Geol. Surv. 
Nebraska, p. 240, Pl. IV., Fig. 19. 
1878. Diplodus compressus J. 8. Newberry, Rept. Geol. Surv. Ohio, Vol. 1, Pt. 
ii., p. 335. 
1875. Diplodus compressus J. S. Newberry, Op. cit., Vol. IL, Pt. IL, p. 45, Pl. LVIIL, 
Fig. 2. 
A single tooth of this species, from the Missourian of Rulo, Nebraska, is 
described and figured by St. John (1872), but mo other examples have since 
been reported from this region. The species also occurs in the Upper Coal 
Measures of south-western Iowa, Indiana, and Ohio. Teeth of D. platypternus 
Cope are abundant in the Permian ‘‘ Red Beds” of Texas. 
CLADODONTIDAE. 
Cladodus occidentalis Lrrpy. 
(Plate 2, Figs. 3, 8, 9.) 
1859. Cladodus occidentalis J. Leidy, Proc. Acad. Nat. Sci. Philad., p. 3. 
1866. Cladodus mortifer Newberry and Worthen, Pal. Illinois, Vol. II., p. 22, 
Pl. 1, Fig. 6: 
1870. Cladodus mortifer O. St. John, Proc. Amer. Phil. Soc., Vol. XL. p. 431. 
1872. Cladodus mortifer O. St. John, Hayden’s Final Rept. U. S. Geol. Surv. 
Nebraska, p. 239, Pl. III, Fig. 6, Pl. VIL, Fig. 13. 
1873. Cladodus occidentalis J. Leidy, Rept. U. S. Geol. Surv. Territ., Vol. L, p. 
311, Pl. X VIL, Figs. 4-6. 
1897. Cladodus mortifer J. S. Newberry, Trans. N. Y. Acad. Sci., Vol. XVI, p. 285, 
PL XXAD., Fig. 2: 
The best description of this species is that given by St. John in 1872, who 
reports its occurrence in the Missourian of the Nebraska City section, Man- 
hattan, Kansas, and south-western Iowa. Teeth of this species occur also in 
the Coal Measures of Illinois and Indiana. 
A number of fragmentary teeth have been obtained by Professor Barbour 
from the Permo-Carboniferous of Roca, and Atchison shales (Missourian) 
of Table Rock, Nebraska, three of which are shown in the accompanying 
illustrations. 
4 
Cladodus knightianus (Cope). 
(Plate 2, Fig. 4.) 
1891. Styptobasis knightiana E. D. Cope, Proc. U. S. Nat. Mus., Vol. XTV., p. 447, 
PL XXXVI, Fig..2: 
Type. — Imperfect crown; Museum of the State University of Nebraska. 
The solitary example upon which Cope based his definition of this species 
was obtained by W. C. Knight from the “ Florence Flint ” (Chase formation) 
