Fia. 
11-15. 
16, 17. 
18. 
19, 20. 
Pale Paes 
22, 23. 
30. 
31, 319, 
82, 32. 
33. 
Pay AWB RXV cia 
PrrTropus ButTtersu, Newb. 
1. Dermal tubercles. 
. Group of united tubercles. Coal Measures, Carlinville, Il. 
CLADODUS CONCINNUS, Newb. (p. 70). 
. Teeth of small form, with two and four lateral denticles. Cleveland shale, Sheffield, Ohio. 
CLapopus TERRELLI, Newb. (p. 170). 
. Teeth. Cleveland shale, Sheffield, Ohio. 
CLADODUS TUMIDUS, Newb. (p. 172). 
. Tooth, posterior face and base, Cleveland shale, Sheffield, Ohio. 
CLADODUS ROMINGERI, Newb. (p. 177). 
. Tooth, posterior face. Waverley, Grindstone City, Mich. 
Gontopus Herrzert, Newb. (p. 69). 
Teeth of various forms. Huron shale, Delaware, Ohio. 
CALLOGNATHUS SERRATUS, Newb. (p. 70). 
Dentary bone, Cleveland shale, Lorain County, Ohio. 
CALLOGNATHUS REGULARIS, Newb. (p. 70). 
Dentary bone. Huron shale, Delaware, Ohio. 
CTENODUS (DipreRus) NELSONI, Newb. (p. 89). 
Teeth. Chemung group, Warren, Pa. 
CTENODUS (DIPTERUS) FLABELLIFORMIS, Newb. (p. 90). 
Teeth, large and small forms. Chemung group, Warren, Pa. 
CrreNnopus (DipTerus) Levis, Newb. (p. 90). 
Teeth. Chemung group, Warren, Pa. 
CTENODUS (DIPTERUS) QUADRATUS, Newb. 
. Teeth. Chemung group, Warren, Pa. 
CTENODUS (DIPTERUS) MINUTUS, Newb. (p. 91). 
. Tooth. Chemung group, Warren, Pa. 
Pu@BODUS POLITUS, Newb. (p. 173). 
**, Tooth; posterior face and base. Cleveland shale, Lorain County, Ohio. 
ORODUS RAMOSUS, Ag. (p. -05). 
- Tooth. Waverly, Grindstone City, Micb. 
CrENODUS WaGNERI, Newb. (p. 172). 
Tooth. Cleveland shale, Cleveland, Ohio. 
CTENODUS SERRATUS, Newb. (p. 226). 
Tooth; upper surface and profile. Coal Measures, Linton, Ohio. 
Diprerus (CTrENopUS) SHERWOODI, Newb. (p. 118). 
Lower tooth, upper surface and profile. Catskill group, Tioga County, Pa. 
Diprerus (CTENODUS) RADIATUS, Newb. (p.119). 
Tooth. Catskill group, Tioga County, Pa. 
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