
PLATE XIL 
PERMIAN VERTEBRATA. JAWS AND VERTEBR&Z OF ERyYOPS 
Fics. 1-9. Eryops megacephalus Cope, 1878. Lower jaw and vertebrae, Amer. Mus. No. 4183, 
Cope Coll., from Lower Permian, Wichita Co., Texas. Specimens figured on 
Pl xis ; 
Fig. 1, la, lower jaw, 2 natural size; fig. 2, 2a, cervical 3, 3a, dorsal, 4, 4a, 
sacral, and 5, 5a, caudal vertebre all 2 natural size; fig. 6, anterior vertebra, 
natural size; fig. 7 posterior dorsal vertebra, natural size; figs. 8-10 not identified. 

