PLATE 25 



Goniophora hamiltonensis (Hall) 

 Page 114. 



Figs. 1 and 2. Cardinal view and left valve of an imperfect specimen. 

 (Snyder Creek shale of Callaway County.) 



Modiomorpha missouriensis Branson 

 Page 114. 



Fig. 3. Left valve of an average specimen. 



Fig. 4. Cardinal view of the same specimen." 



Fig. 5. Left valve of a specimen with strongly projecting umbones. 



Fig. 6. Cardinal view of a small specimen. 



Figs. 10 and 11. Side and cardinal views of an interior mould. 



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



Clinopistha rowleyi Branson 

 Page 111. 



Figs. 7 and 8. Cardinal and side views of an average specimen. 

 (Snyder Creek shale of Callaway County.) 



Paracyclas lirata (Conrad) 

 Page 116. 



Fig. 9. Left valve of a large specimen resembling P. elliptica. 



Fig. 12. Right valve of an average specimen slightly broken in front. 



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



Nucula cf. lirata (Conrad) 

 Page 112. 



Figs. 13 and 14. Side and cardinal views. 



(Snyder Creek shale of Callaway County.) 



Grammysia elliptica Hall 

 Page 111. 



Fig. 15. A left valve slightly tilted from a cardinal view. 

 (Snyder Creek shale of Callaway County.) 

 Fig. 16. Another view of the same valve. 



Nucula snyderensis Branson 

 Page 112. 



Fig. 17. Cardinal view of an average specimen. 



(Snyder Creek shale of Callaway County.) 

 Fig. 18. Right valve of the same specimen. 



