34 Batrachia of the Permian Period of North A merica. [ January, 
heavy, the pubis being thickened in front, and truncated with a 
flat V-shaped face with reverted lip. 
Three species of this genus are known. The most abundant 
in the Permian of Texas is the £. megacephalus Cope (Figs. 1 and 
5-6). This is the largest American batrachian, the skull meas- 
uring a foot wide by eighteen inches long. It was very abun- 
Fic. 5.—LZryops megacephalus Cope, skull from above, one-fifth nat. size. . 
dant, constituting with the reptilian genus Dimetrodon, the most 
prominent type of the Permian fauna in this country. The ver- i 
tebral column is slender when compared with the size of the i 
limbs, and especially of the head. The restoration of a species 
of European Labyrinthodon by Mr. Waterhouse Hawkins does 
w 
RSE 
not badly represent this species. The Æ. reticulatus Cop® | 
a much smaller species, and the sculpture of the s ol Pi 
