168 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



1872. Diplodus compressus O. St. John, Hayden's Final Kept. U. S. GeoL Surv. 



Nebraska, p. 240, PI. IV., Fig. 19. 



1873. Diplodus compressus J. S. Newberry, Rept. Geol. Surv. Ohio, Vol. I., Pt. 



ii., p. 335. 

 1875. Diplodus compressus J. S. Newberry, Op. cit., Vol. IL, Pt. XL, p. 45, PI. LVIII., 

 Fig. 2. 



A single tooth of this species, from tlie Missourian of Rulo, Nebraska, is 

 described and figured by St. John (1872), but no other examples have since 

 been reported from this region. The species also occurs in the Upper Coal 

 Measures of south-we.stern Iowa, Indiana, and Ohio. Teeth of D. platypternus 

 Cope are abundant in the Permian " Red Beds" of Texas. 



CLADODONTIDAE. 



Cladodus occidentalis Lkidy. 



(Plate 3, Figs. 3, 8, 9.) 



1859. Cladodus occideyitalis J. Leidy, Proc. Acad. Nat. Sci. Philad., p. 3. 



1866. Cladodus mortifer Newberry and Wortlien, Pal. Illinois, Vol. II., p. 22, 



PI. I., Fig. 5. 

 1870. Cladodus mortifer O. St. John, Proc. Amer. Phil. Soc, Vol. XL, p. 431. 



1872. Cladodus mortifer 0. St. John, Hayden's Final Rept. U. S. Geol. Surv. 



Nebraska, p. 239, PI. Ill , Fig. 6, PI. VI., Fig. 13. 



1873. Cladodus occidentalis J. Leidy, Rept. U. S. Geol. Surv. Territ., Vol. I., p. 



311, PI. XVIL, Figs. 4-6. 

 1897. Cladodus mortifer J. S. Newberry, Trans. N. Y. Acad. Sci., Vol. XVI., p. 285, 

 PI. XXII., 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 Pei-nio-Carboniferous of Roca, and Atchison shales (Missourian) 

 of Table Rock, Nebraska, three of which are .shown in the accompanying 

 illustrations. 



Cladodus knightianus (Cope). 



(Plate 3. Fig. 4.) 



1891. Styptobasis Icnitjhtiana E. D. Cope, Proc. U. S. Nat. Mus., Vol. XTV., p. 447, 

 PI. XXVIli., 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) 



