186 REPORT—] 874. 
Eosaurus, Marsh. 
Two vertebral centra, about 23 inches m diameter, biconcave, discoidal, well- 
ossified. They were described as Enaliosaurian, but Prof. Huxley has suggested 
that they may possibly be Labyrinthodont. 
HK. ACADIANUS, Marsh. 
Locality. South Joggins, Nova Scotia. 
References. Marsh, American Journal of Sci. & Arts, vol. xxxiy. p. 1, t. i. figs. 1, 
2 [1862].—Id. Q. J. Geol. Soc. vol. xix. p. 52 [1863] (abstract).—Huxley, 
Q. J. Geol. Soc. vol. xix. p. 62 [1863].—Dawson, Acadian Geology, 2nd ed. 
p. 382, fig. 148 [1867]. 
Erpetocephalus, Huxley. 
Skull (figure). Parabolic? ; posterior border indented by wide auditory openings, 
Orbits. Central, oval, rather large, distant. Cranial sculpture. Irregular, rugose ; 
no mucous grooves distinguishable. Teeth. “The right ramus of the mandible ex- 
hibits a number of small sharp-pointed conical teeth, set in a single series.” 
E. rucosus, Huxley. 
Locality. Jarrow Colliery, Kilkenny. 
References. Huxley, “Description of Fossil Vertebrata from the Jarrow Colliery, 
Kilkenny,” Trans, Royal Irish Acad. vol. xxiv. p. 18, t. xxiii. fig. 2 [1867 ]. 
Eupelor, Cope. 
Founded upon a pitted fragment of the upper cranial surface. The teeth origi- 
nally described as those of Eupelor are now supposed by Prof. Cope to belong to 
Thecodonts. 
E. purus, Cope (= Mastodonsaurusdurus, Cope). 
Locality. Triassic Red Sandstone near Phcenixville, Chester County, Pennsyl- 
vania. 
References. Cope, Proc. Acad. Nat. Sci. Philadelphia, 1866, p. 249.—Jd. Synopsis, 
p- 25. 
Eurythorax, Cope. 
“ Wstablished on a large thoracic shield of peculiar form. It is a median, and 
exhibits broad smooth surfaces for the contact of the overlapping margins of 
the lateral plates. The form is subrotund, with a large excavation from the pos- 
terior margin on each side. The narrowed portion left has a convex outline. 
Sculpture none. The form resembles remotely the corresponding scute of Tudi- 
tanus punctulatus, the posterior narrow face representing the xiphisternal process of 
that species.” 
E. sustzvis, Cope. 
Locality. Coal-measures, Linton, Columbiana County, Ohio. 
References. Cope, Proc. American Phil. Soc. 1871, p. 177.—Id. Supplement, p. 15. 
Labyrinthodontosaurus, Barkas. 
The teeth and fragment of mandible thus named are known to us only from Mr. 
Barkas’s description and figures. They can hardly be Labyrinthodont, but much 
resemble a genus of fossil fishes, 
L, Suma, Barkas. 
Locality. Low-Main Coal-Shale, Northumberland. 
References. Barkas, Coal-measure Paleontology, pp. 75, 94 [1873].—Atlas of 
Carboniferous Fossils, t. ix. fig. 194, t. x. figs. 223, 223 a, 224 [1873]. 
