EXPLANATION OF PLATE XLV. 



Figs. 1-31. SPIRIFER PELLAENSIS n. sp p. 340 



1-3. Pedicle, brachial and anterior views of a large specimen. 

 4-7. Pedicle, brachial, posterior and anterior views of another 

 specimen. 



8-9. Pedicle and brachial views of a very large specimen. 

 10-11. Brachial and anterior views of a nearly perfect specimen. 

 12-14. Brachial, pedicle and lateral views of a nearly perfect 

 specimen. (W. M., No. 13571.) 



Pella Beds, Pella, Iowa. 



15-16. Posterior and anterior views of a specimen with a short 

 hinge-line. (W. M.) 

 Pella Beds, Iowa. 



17-18. Pedicle and brachial views of a nearly perfect specimen. 

 19-21. Lateral, brachial and pedicle views of a nearly perfect 

 specimen. (W. M., No. 5771.) 



Pella Beds, Fort Dodge, Iowa. 



22-23. Brachial and posterior views of a nearly perfect specimen, 

 the holotype. 24-25. Posterior and lateral views of another 

 specimen. (W. M., No. 7535.) 



Pella Beds, Keosauqua, Iowa. 



26-27. Pedicle and brachial views of a nearly perfect specimen. 

 28-29. Pedicle and brachial views of another specimen. (W.M., 

 No. 7247.) 



Maxville limestone, Fayette County, Pennsylvania. 

 30. View of an internal cast of a pedicle valve. 31. View of an 

 internal cast of a brachial valve. (W. M., No. 338.) 

 Residual chert, Springfield, Missouri. 



106 



