PLATE XXVI. 



Page. 



Fi(iS. 1-5. Ctoni.vtites crexistria Philip.^ 68 



Figs. 1,2. Early adult stage, IJ times enlarged, Lctwer Carboniferous, St. Louis-Chester 



stage, Moorefield, Ark. 

 Fig. 3. Septa, naturalsize, IMoorefield, Ark. 

 Fig. 4. Septa, from the Lower Carboniferous limestone of the Iberg, near (_Trund, in the 



Hartz, IJ times enlarged. 

 Fig. 5. Surface ornamentation, Lower Carboniferous, St. Loui.s-Chester stage. Boles, Ark. 



Figs. 6-13. (toxi.vtites strhtus Sowerby 80 



Figs. 6, 7. Lower Carboniferous, St. Louis-Chester stage, Batesville, Ark., 9.3 mm. 



diameter, o times enlarged. 

 Fig. 8. Lower Carboniferous, St. Louis-Chester stage. Batesville, Ark., 14 mm. diameter, 



Ij times enlarged. 

 Fig. 9. Adult septa enlarged, Batesville, .^rk. 

 Fig. 10. Internal septa enlarged, Batesville, Ark. 

 Fig. 11. Septa of young twice enlarged, Batesville, Ark. 

 Figs. 12, 13. Adult, natural size, Batesville, Ark. 



Flos. 14-18. GoxiATiTEs suBCiRCCLARis .Miller 81 



Figs. 14,15. Three times enlargeil, St. Ijouis-Chester stage, Batesville, Ark. 

 Figs. 16,17. Twice enlarged, Batesville, .\rk. 

 Fig. 18. Septa from the above specimen. 



200 



