Fie le ik 
PERMIAN VERTEBRATA 
VERTEBRATE REMAINS FROM VERMILLION Co., ILLINOIS 
Nomenclature 
Cope, 1880-3 Revised, 1915 
Orthacanthus quadriseriatus Pleuracanthus quadriseriatus 
Diplodus compressus Diacranodus texensis 
Ctenodus pusillus Gnathorhiza pusilla 
a gurleyanus Sagenodus fossatus 
+ fossatus i. fossatus 
Ceratodus paucicristatus : paucicristatus 
“_-vinslovii a vinslovii 
Peplorhina arctata Spherolepis arctata 
Janassa strigilina Janassa strigilina 
“ gurleiana “ gurleiana 
Archeobelus vellicatus Archeobelus vellicatus 
Cricotus heteroclitus » Cricotus heteroclitus 
Lysorophus tricarinatus Lysorophus tricarinatus 
Diplocaulus salamandroides Diplocaulus salamandroides 
Fies. 1-50. Vertebrate remains from the Permian bone bed of Vermillion County Illinois. This 
fauna described by Professor Cope in 1877 was the first Permian fauna found in 
North America, and contains the genotypes of many of the genera later described 
from better material in Texas and New Mexico. The collection is the property 
of the Walker Museum of the University of Chicago, and has been redescribed 
by Dr. E. C. Case (1900) in the Journal of Geology, Vol. VIII, pp. 698-729, with 
five plates of figures. The revised nomenclature is auct. Case and Hussakof 
1911. 
Fias. 1, la. Plewracanthus quadriseriatus (Cope, 1877). Fragment of head spine, X 2. Type 
specimen, No. 6502, Walker Mus. (Case, 1900; pl. i, fig. 3). 
Frias. 2-4. Diacranodus texensis (Cope, 1890). Teeth, No. 6504, Walker Mus., referred by 
Cope to Diplodus (Didymodus) compressus Newberry. (Case, 1900, pl. i, fig. 5; 
I am unable to state the enlargement, as Dr. Case does not give it in his figure, 
nor have measurements been published). 
Fic. 5. Spherolepis arctata (Cope, 1877). Dentigerous plate, x 3. Type specimen No. 6511, 
Walker Museum. (Hussakof, 1911, pl. xxxi, fig. 2). 
G. 6, 6a, 6b, 6c. Gnaithorhiza pusilla (Cope, 1877). Right palatal plate, x 3, type specimen, 
No. 6508, Walker Mus. (Case, 1900, pl. i, fig. 9; Hussakof, 1911, pl. xxvii, fig. 10). 
Fia. 7, 7a, 7b. Sagenodus fossatus (Cope, 1877). Upper dental plate, natural size, No. 6509, 
Walker Mus., type of Ctenodus gurleyanus Cope, 1877. (Case, 1900, pl. i, fig. 8; 
Hussakof, 1911, pl. xxvi, fig. 9). 
Fia. 8, 8a, 8b, 8c. Sagenodus fossatus (Cope, 1877). Imperfect left mandibular plate, immature, 
about $ natural size. Type specimen, No. 6506, Walker Museum. (Case, 1900, 
pl. i, fig. 10; Hussakof, 1911, pl. xxvi, fig. 8). 
Fic. 9, 9a, 9b, 9c. Sagenodus pancicristatus Cope, 1877. Imperfect dental plate, natural size, 
Type specimen, No. 6505 Walker Mus. (Case, 1900, pl. i, fig. 11; Hussakof, 
1911, pl. xxvii, fig. 4). 
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