EASTMAN: CARBONIFEROUS FISHES FROM THE CENTRAL WEST. 223 
Fig. 9. Cladodus occidentalis Leidy. Atchison shales (Missourian); Springfield, 
Sarpy County, Nebraska. Fragmentary basal portion viewed from the 
inner face, with lateral denticles preserved on one side, and showing 
prominent nutrient foramina of root. 
Fig. 10. Ctenoptychius occidentalis (St. J. and Worth.). Atchison shales (Missou- 
rian); Richfield, Sarpy County, Nebraska. Outer coronal face of a 
weathered specimen, the root broken away. 
Fig. 11. Fissodus inaequalis (St. J. and Worth.). Atchison shales (Missourian) ; 
Peru, Nemaha County, Nebraska. Inner coronal face of same specimen 
as shown in Plate 3, Fig. 26. 
Fig. 12. Fissodus dentatus, sp. nov. Missourian; Topeka, Kansas. Outer coronal 
face of tooth, the root broken away. Marks of contact with next older 
tooth are distinctly shown, serrations of lateral edges but faintly, in the 
photograph. 
Fig. 138. Janassa unguicula, sp. nov. Atchison shales (Missourian) ; Cedar Creek, 
Cass County, Nebraska. Outer coronal face of tooth, the root broken 
away. The portion overlapped by next older tooth in front is in- 
dicated by the darker area at the base of crown. 
Fig. 14. Helodus rugosus Newb. and Worth. Base of Cottonwood or summit of 
Atchison shales (Missourian) ; Table Rock, Pawnee County, Nebraska. 
Inner face of nearly perfect tooth. 
Fig. 15. Campodus variabilis (Newb. and Worth.). Neosho formation (Permo- 
Carboniferous) ; Roca, Lancaster County, Nebraska. Coronal surface 
of supposed postero-lateral tooth, differing somewhat from any de- 
scribed by St. John and Worthen. 
Fig. 16. Campodus variabilis (Newb. and Worth.). Atchison shales (Missourian) ; 
Louisville, Cass County, Nebraska. Coronal surface of a slightly 
asymmetrical tooth with feebly developed buttresses along the outer 
margin, and most nearly agreeing with the tooth figured by St. John 
and Worthen in Pl. VIII., Fig. 4, of the sixth volume of the Illinois 
Palaeontology. 
Fig. 17. Petalodus alleghaniensis Leidy. Atchison shales (Missourian); South 
Bend, Cass County, Nebraska. Anterior (outer) face of a broad-rooted 
and symmetrical tooth presumably situated in the azygous series in 
front. The opposite face of the same specimen is shown in Plate 3, 
Fig. 27. 
Fig. 18. Petalodus alleghaniensis Leidy. Base of Cottonwood or summit of 
a Atchison shales (Missourian) ; Table Rock, Pawnee County, Nebraska. 
| Posterior aspect of fragmentary specimen showing difference in form 
| of root as compared with teeth occupying a position in the median 
azy gous in front. 
Fig. 19. Deltodus angularis Newb. and Worth. Permo-Carboniferous ; Blue Springs, 
Gage County, Nebraska. Coronal surface of posterior dental plate 
referred to the right mandibular ramus. 
Fig. 20. Streblodus angustus, sp. nov. Atchison shales (Missourian); South Bend, 
Cass County, Nebraska. Coronal surface of posterior dental plate re- 
ferred to the left ramus of the upper jaw. 
Fig. 21. Janassa maxima, sp.nov. Atchison shales (Missourian) ; Richfield, Sarpy 
County, Nebraska. Posterior (inner) coronal face of a fractured and 
