PLATE 20 



Syringothyris n. sp. 

 Page 1C4. 



Figs. 1 and 2. Side and posterior views of an iir perfect mould. 

 (Mineola of Montgomery County.) 



Syringothyris occidentalis (Swallow) 

 Page 103. 



Figs. 3-5. Posterior, anterior, and lateral views of- a perfect interior mould of a small 

 specimen. (Callaway limestone of Callaway County.) 



Spirifer sitbvaricosus H. & W. 

 Page 101. 



Figs. 6 and 7. Front and side views of an imperfect pedicle valve. 

 (Mineola of Ralls County.) 



A try pa spinosa Hall. 

 Page 98. 



Fig. 8. Brachial valve of an average specimen. 



Figs. 9, 10, 11. Lateral, pedicle, and brachial views of an average specimen. 

 (Snyder Creek shale of Callaway County.) 



Eunella lincklcsni (Hall) 

 Page 93. 



Figs. 12, 14 and 16. Brachial, lateral, and pedicle views of an average specimen. 



Fig. 13. Lateral view of an average specimen. 



Fig. 15. Lateral view of a gibbous specimen. (Mineola of Montgomery County.) 



Cranaena romingeri (Hall) 

 Page 96. 



Figs. 17, 18, 19. Lateral, pedicle, and brachial views of an average specimen. 

 (Mineola of Ralls County.) 



Cranaena iowaensis (Calvin) 

 Page 95. 



Figs. 20, 21, 22. Brachial, lateral, and pedicle views of a large specimen. 

 (Callaway limestone of Callaway County.) 



