PLATE IX. — (Continued.) 

 Cyrtia exporrecta Wahl.= f 0. Mtrtia Bill. 



Pages 183 and 196. 

 Figs. 22, 23. Profile and cardinal views. This and the preceding species are 

 regarded as from the horizon of the Clinton Group, 



Rhynchonella Tennesseensis Roemer. 



Page 197. 

 Figs. 24, 25, 26. Dorsal, profile and front views. 



Rhynchonella Saffordii Hall. 



Page 197. 

 Figs. 27-29. Dorsal, front and profile views. 



Pentamerus NUCLEUS H. & W. 

 Page 200 a. 

 Figp 30-32. Dorsal, profile and front views. 



Discina {Orbiculoidea 9) qrandis Vanuxem. 



Page 187. 

 Figs. 33, 34. Lateral and vertical views of a specimen. 

 Fig. 35. Ventrai side of a larger individual. 



Crania Bordeni H. & W. 



Page 187. 

 Figs. 36, 37. Vertical and profile views of a specimen attached to the valve of a 

 Spirifer. 



DlCTYONEMA PERGRACILIS H. & W. 

 Page 181. 

 Fig. 38. View of the specimen described. 



