PLATE 13 



Stropheodonta callawayensis Swallow 

 Page 75. 



Fig. 1. Brachial view of a large specimen. 



(Collection of D. K. Greger. Photo by Greger.) 

 Fig. 2. Pedicle view of a large specimen with left end of hinge broken away. 

 Fig. 3. Pedicle view of a small specimen grading toward 5. demissa (Conrad). 

 Fig. 4. Pedicle view of a specimen with unusually s nail sharp plications. 

 Fig. 5. Back view of an unusually thick-shelled specimen. Both ends of hinge missing 

 (All specimens from the Snyder Creek shale of Callaway County.) 



Stropheodonta boonensis Swallow 

 Page 75. 



Fig. 6. Pedicle view of an immature specimen. 



Figs. 7 and 8. Pedicle views of average specimens. 



Fig. 9. Side view of an average specimen. 



Figs. 10 and 11. Side and pedicle views of a small specimen. 



Fig. 12. Brachial view showing concavity of brachial valve. 



(All specimens from the Snyder Creek shale of Callaway County.) 



Stropheodonta inflexa Swallow 

 Page 81. 



Figs. 13, 16, and 17. Pedicle, side, and brachial views of an average specimen. 

 Figs. 14 and 15. Brachial and side views of an average specimen. 



(All specimens from the Snyder Creek shale of Callaway County.) 



