EXPLANATION OF PLATE XLIX. 



Figs. 1-14. SPIRIFER KEOKUK Hall p. 350 



1-4. Pedicle, brachial, anterior and lateral views of a nearly com- 

 plete specimen. 5-9. Pedicle, brachial, lateral, posterior and 

 anterior views of another specimen. (W. M., No. 13519.) 

 10-14. Posterior, lateral, brachial, pedicle and anterior views of 

 a third specimen. (W. M., No. 5626.) 

 Keokuk limestone, Keokuk, Iowa. 



Figs. 15-19. SPIRIFER FLOYDENSIS n. sp p. 351 



15-16. Brachial and lateral views of one of the cotypes. (W. M. 

 No. 13526.) 



Knobstone formation, Indiana. 



17-19. Brachial, anterior and lateral views of another cotype. 

 (W. M., No. 13525.) 



Knobstone formation, Floyd County, Indiana. 



114 



