PLATE XXXIV. 



Cypricardites halli. 

 Fig. 1-6. A series of specimens showing variation in size and form. Page 206 



Orthis linneyi. 

 Fig. 7-13. A series of specimens showing variation in size and form. Page 41 



Orthis borealis. 



Fig. 14-20. A series of specimens showing variation in size and form. Page 36 



Zygospira kentuckiensis. 

 Fig. 21-25. A series of specimens showing variation in size and form. Page 138 



Rhynchonella increbescens. 

 Fig. 26-29. Dorsal, ventral, front and profile view of a specimen. Page 83 



Orthis flabellum, 



Fig. 30. Dorsal view of a specimen. Page 38 



Stricklandinia louisvillensis. 

 Fig. 31-34. Ventral, dorsal, profile and cardinal view of a specimen. Page 65 



Cyrtia exporrecta, var. arrecta. 



Fig. 35. Cardinal view of a specimen. Page 94 



