APPENDIX. 
S3 
REPTILIA. 
CROCODILIA. 
Tiiecaciiampsa sp. Sampson county, N . C. 
Vertebra? in the State collection at Raleigh. 
THECACHAMPSA RUGOSA. Emmons. 
Polyptychodon rugosus. Emmons, Geol. Surv. Korth Carolina. 
Emmons’ ligure of this species is not distinguishable from a worn canine 
of a Basilosaurus, and as such I regarded it on a for mer occasion. An 
examination of a specimen received from Prof. Kerr, shows that its affin- 
ities are Crocodilian, and its structure similar to that of Thecachampsa, 
Cope. It is more strongly rugose-striate than in any of the known species 
but is approached in rugosity by Thecachampsa sguankensis , Marsh. The 
range of the genus is thus extended to Korth Carolina. 
Pliogonodon prisctts. Leidy, Proc. Acad. Kat. Sci. Phil. 1856, 255, 
P. nobilis Leidy. Emmons’ Geolog. Survey N. C., 1858, p. 223, figs. 43, 44. 
PGLYDECTES. Cope. 
Proceed. Arner. Philos. Society, 1870, 271. 
This genus is indicated by one, perhaps more teeth, which resembles in 
some respects those of the Crocodilian genus Thecachampsa. Crown or 
dense concentric dentinal layers, with small pulp cavity. Enamel with 
two prominent ridges separating inner from outer aspects, but approxi- 
mated on the inner face, which thus included, is but one-third the circum- 
ference of the tooth. Ridges extending from tip to near base of crown, 
with a sulcus along the inner side of each. Crown acuminate, a little 
swollen at the base and above the middle, section circular. 
POLYDECTES BITIIRGIDUS. Cope. 
Crown, a slender cone slightly curved near the base. Middle portion 
constricted, its surface marked with narrow obscure facets. On the inner 
face, a shallow groove within each of the bounding sulci, the two separated 
by an indistinct groove. The enamel is smooth and worn, and leaves no 
traces of other sculpture. 
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