PLATE 11 



Crania famelica H. and W. 

 Page 72. 

 Figs. 1 and 2. Top and side views of an average specimen. (XI J^). 

 (Snyder Creek shale from Callaway County.) 



Stropheodonta demissa (Conrad) 

 Page 77. 

 Fig. 3. An interior of a pedicle valve. (Snyder Creek shale of Callaway County.) 

 Fig. 8. A small specimen with the beginning of the arrangement of plications in bun- 

 dles which culminated in S. mineolaensis Branson (X2). 

 (Mineola limestone of Montgomery County.) 



Schizophoria propinqiia (Hall) 

 Page 74. 

 Fig. 4. A small specimen of pedicle valve. (X"2.) 



(Mineola limestone of Montgomery County.) 



Schuchertella cf. pandora (Billings) 

 Page 84. 

 Fig. 5. A small pedicle valve. 

 Fig. 14. Posterior view of an imperfect pedicle valve. 



(Mineola limestone of Montgomery County.) 



Stropheodonta navalis Swallow 

 Page 82. 

 Fig. 7. Plications and punctation of an average specimen. (X5). 

 (Snyder Creek shale of Callaway County.) 



Stropheodonta equicostata Swallow 

 Page 79. 

 Fig. 6. Plications and punctation of an average specimen. (X5). 

 (Snyder Creek shale of Callaway County.) 



Pholidostrophia iowaensis (Owen) 

 Page 82. 

 Fig. 9. Interior of a small brachial valve. 



(Mineola limestone of Montgomery County.) 



Productella callawayensis (Swallow) 

 Page 85. 

 Fig. 10. A small pedicle valve. 



Fig. 16. A pedicle valve of medium size with spines unusually preserved. 

 (Snyder Creek shale of Callaway County.) 



Stropheodonta booncnsis (Swallow) 

 Page 75. 

 Fig. 11. Plications and punctation of an average specimen. (X5.) 

 (Snyder Creek shale of Callaway County.) 



Strophonella crassa (Rowley) 

 Page 83. 

 Fig. 12. Side view of type. 

 Fig. 13. Brachial view of type. 

 Fig. 14. Posterior view of type. 



(Snyder Creek shale of Callaway County.) 



Stropheodonta inequiradiata Hall 



Fig. 15. Details of plications and striations. 



(Mineola limestone of Montgomery County.) 



