PLATE VI. 



Page 



Fig. 1. G.\.sTRiocERAS GLOBULosrM Meek and Worthen 80 



Middle Coal Measures, near Boles, Ark. Shows the surface markiugs of the shell. 

 Figs. 2-5. Goniatites lunatus Miller and Gurley 77 



Coal Measures, Elkhorn Creek, Kentucky. 

 Figs. 6-8. Prolecanites louisianexsis Rowley 5-1 



Lower Carboniferous, Kinderhook stage, Louisiana, Mo. 

 Figs. 9-n. Bactrites carboxarii's Smith 31 



Lower Carboniferous, St. Loui.s-Chester stage, Moorefield, Ark. 



Note.— Fig. 1 is from Proc. Am. Philos. Soc, Vol. XXXV, PI. XVIII, fig. 4. 



Figs. 2-.5 are from Bull. Illinois State Mus. Nat. Hist. No. II, PI. V, figs. 2-5. 



Figs. 6-8 are after a specimen loaned by the Walker Museum, University of Chicago. 



160 



