Fig. iL 
ry 
uo) 
5, 6, 6% 
10, 109, 10. 
11. 
12, 13. 
14. 
15, 16. 
17. 
268 
PLAT EH Xo: 
OnycHopus OrrToNtI, Newb. (p. 71). 
Intermandibular bone, with teeth, side view. 
Section of same. 
Huron shale, Perry, Franklin County, Ohio. 
GANORHYNCHUS BEECHERI, Newb. (p. 95). 
. Labial margin of upper jaw. 
Chemung group, Warren, Pa. 
ANTLIODUS ARCUATUS, N. & W. (p. 208). 
. Tooth, outside. 
- Inside view of larger specimen. 
Saint Louis limestone, Greencastle, Ind. 
Potyruizopus Lirront, N. & W. (p. 209). 
Tooth, outside, inside and section. 
Greencastle, Ind. 
PSAMMODUS GLYPTUS, St. J. & W. (p. 210). 
. Teeth, upper surface. 
Greencastle, Ind. 
LABODUS MARGINATUS, Newb. (p. 198). 
. Palate tooth, crown surface. 
Greencastle, Ind. 
DINICHTHYS, sp. ? 
Three views—front, rear, and profile—of premaxillary. 
PHYLLOLEPIS DELICATULA, Newb. (p. 97). 
Scale or scute, natural size. 
Chemung group, Bradford County, Pa. 
HoLorrycuius AMERICANUS, Leidy (p. 113). 
Scales, natural size. 
Catskill, Tioga County, Pa. 
HOLOPTYCHIUS TUBERCULATUS, Newb. (p. 101). 
Scale, natural size. 
Chemung group, Leroy, Pa. 
HOLOPTYCHIUS GIGANTEUS?, Ag. (p.101). 
Scales, natural size. 
Catskill, Tioga County, Pa. 
ORTHOPLEURODUS CARBONARIUS, N. & W. (sp.) (p. 200). 
Terminal tooth, upper surface, natural size. 
Coal Measures, Carlinville, Ill. 
