PLATE IV. 



Page. 

 Figs. 1-3. Goniolobocera.s goniolobim Meek 128 



Coal Measures, New Mexico. 

 Figs. 4-8. G.vstriocekas kingi Hall and Whitfield 92 



Coal Measures, Eberhardt Mill, White Pine, Nev. 

 Figs. 9-11. P.\ealegoceras baylorense White 99 



Permian, Wichita formation, military crossing of Big Wichita River, Baylor County, Tex. 

 Fitis. 12-14. Paralegoceras iowense Meek and Worthen 100 



Middle Coal Measures, Alpine, Iowa. 



Note.— Figs. 1-3 are from U. S. Geol. Expl. Fortieth Parallel, Vol. IV, Pt. I, PI. IX, figs. 5, 5a, 5b. 

 Figs. 4-8 are from U. S. Geol. Expl. Fortieth Parallel, Vol. IV, Pt. II, PI. VI, figs. 9-14. 

 Figs. 9-11 are from Bull. U. S. Geol. Survey No. 77, PI. II, figs. 1-3. 

 Figs. 12-14 are from Geol. Surv. Illinois, Vol. II, PI. XXX, figs. 3a-c. 



156 



