PLATE XIX. 



PAGE 



SCHIZODUS? CIKCULUB Worthen UHI 



Fig. 1. View of a single valve, natural size. 



SANOUINOLITES? MVLTISTBIATUS Wortheii ]> 



Fig. ?. View of left valve, natural size. 



CLINOPISTHA BADIATA Hall sp 122 



Fig. 3. View of a left valve natural size. 

 Fig. 3 a. Outlines of a transverse section. 



NUCULA ILLINOIENSIS Worthen ] as 



F ig. 4. Outline view of left valve, natural size. 

 Fig. 4 . View of same enlarged 2X. 



SOLEKOMYA? lovENSis Worthen K5L' 



Fig. 5. Outline view of left valve, natural size. 

 Fig. 5 a. View of same enlarged 2X. 



PINNA SANCTI-LUDOVICI Wortheii '. in 



Fig. li. Lateral view of specimen, natural size. 

 Fig. 6 n. Outline of a transverse section. 



SCHIZODUS VAKSOVIENSIS Worthen ln7 



Fig. 7. View of both valves, natural size. 



SOLENOMYA VABSOVIENSIS \Vorth6n ]:>,] 



Fig. 8. View of left valve, natural size. 

 Fig. 8 n. Dorsal view of the same. 



CABDIOMOBPHA? PELLENSIS Wortheii 12(; 



Fig. 9. View of rigth valve, natural size. 

 Figs. ! n, &. Profile views of same. 



AU.OBISMA ELONGATA Worthou i: 



Fig. 10. View of right valve, natural size. 

 Fie. 10 a. Outline of a traiworso section. 



