Page:Synopsis of the Exinct Batrachia and Reptilia of North America. Part 1..pdf/13

Rh AND AYES OF NORTH AMERICA. 9 PELION, Wyman. Proc. Acad. Natl. Sci. Philadelphia, 1808, p. 211. Eaniceps, Wyman Amer. Journal Sci. and Arts, 18;8,p. 158. Not of Cuvier, (Pediculati.) PELION LYELLII, TVy9nan. Baniceps lyeelii, Wyman, 1. c. This animal differs from the genus Amphibanms, in the well ossified vertebral axis; no remains of a tail with elevated neural spines exist in the type specimen, nor have ventral scales or sclerotic bones been seen. Middle Coal Measures, Jefferson county, Eastern Ohio. HY LON OMUS, Dawson. • This genus embraces the smallest species of the order. They all pertain to that interesting Batiachian fauma of the Coal Measures of the Joggins of Nova Scotia, eluci-dated chiefly through the exertions of Principal Dan son, of Montreal. This fauma embraces six of the Microsauria and one true Labyrinthodont. Of the former, the Thlerpeton dawsonii Owen, is the largest species, the Dendropetons next, and the Hylonomus wymanii is the smallest. As Dr. Dawson has described these curious animals in the "Canadian Naturalist," in detail, I will not repeat them here, but add a list expressing some peculiarities of dentition, which are highly important in the deter_ mination of species. This, giving the number of teeth in a line of 1-12th of an inch, has been furnished me by Prof. Dawson. Loc. Cit. VIII., MT, Loc. Cit. VIII., 258, Loc. Cit. VIII., 270, HYLONOMUS LYELLII, Dawson. Coal Measures of Nova Scotia. HYLONOMUS ACIEDENTATUS, Dawson. Coal Measures; with the last. HYLONOMUS WYAIANII, Dawson. Dendrerpeton aeadianttM. Outer series of teeth, Inner do. D. omit Outer Series, Inner do. Hylerpeton dctlesonit; Hylonomus H. toymunii, smntr. PHILOSO. SOC.-VOL. X V. 3 Coal Measures ; with the last. So. of Teeth in Line. 4 teeth iu one line to 11 line. 4 in 21 lines. 4 in one line. 4 iu two to 2+ lines. 4 in five lines. 12 in two lines. 12 iu U lines.