AND AV.ES OF NOKTII. AMERICA. 



P ELI ON, Wyman. 



Proo. Acad. Natl. Bci. Philadelphia, 1868, p. 911. BankepB, Wyman Amer. Journal Soi. and Arts, 1858,p. 108. 

 Not of Cuvior, (Pedioulati.) 



PELION LYELLII, Wyman. Baniceps lyeelii^ Wyman, I.e. 



This animal differs from the genus Amphibamus, 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. 



II STL ON OMITS, Dawson. 



Tins genus embraces the smallest species of the order. They all pertain to that 

 interesting Batrachian fauma of the Coal Measures of the Joggins of Nova Scotia, eluci- 

 dated chiefly through the exertions of Principal Dawson, of Montreal. This fauma 

 embraces six of the Microsauria and one true Labyrinthodont. Of the former, the 

 Hylerpeton dawsonii Owen, is the largest species, the Dendropetons next, and the 

 Uylonomus 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. 'Ibis, giving the number of teeth in a line of 1-1 2th of an inch, has 

 been furnished me by Prof Dawson. 



Lou. Git. VIII., 107, 



Loo. Git. VIII., 258, 



HYLONOMUS LYELLII, Dawson. 



Coal Measures of Nova Scotia. 



HYLONOMUS ACIEDLNTATUS, Dawson. 



Goal Measures ; with the last. 



HYLONOMUS WYMANII, Dawson. 



LOC. Git. VIII., 270, 

 Dendrerpeton aeadianwm. 



Outer series of teeth, 

 Inner do. 



D. owenii. 



Outer Series, 



Inner do. 

 Hylerpeton dawso n/ii, 

 //i/lonomtis lyelli, 

 II. wymanii, 

 AMEKI. I'lIILOSO. SOU. — VOL. XIV. H 



Coal Measures ; with the last. 



No. of Teeth in Line. 



4 teeth in one lino to l.| line. 

 4 in 2| lines. 



4 in one lino. 



4 in two to 2£ lines. 



4 in five lines. 

 12 in two lines. 

 12 in U lines. 



