PLATE IX. 



Page. 



Figs. 1-3. (j astriocer.\.s compressum Hyatt 86 



Lower Carl)oiiiferous, 8t. Louis-Chester stage. Bend formation, San Saba County, near 

 Bend, Tex. 



Specimen Nat. Museum. 

 Fuis. 4-7. Par.\legocer.vs iowense ]Meek and \N'orthen 100 



Lower Carboniferous, St. Louis-Chester stage, Bend formation, near Bend, San Saba 



County, Tex. 

 Figs. 4 and 5. Immature shell. 

 Fig. 6. Septa at this stage. 

 Fig. 7. Enlarged view of the shell at this stage. 



Note. — Figs. 1-3 are from Second Ann. Eept. Geol. Surv. Texas, figs. 57-59 (p. 355). 

 Figs. 4-7 are from Fourth Ann. Rept. Geol. Surv. Texas, tigs. 52-55 (p. 474). 



166 



