EXPLANATION OF PLATE XLIV. 



Figs. 1-14. SPIRIFER WASHINGTONENSIS n. sp p. 339 



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

 plete specimen. 5-7. Posterior, pedicle and anterior views of 

 another specimen. 8-9. Brachial and lateral views of a third 

 specimen. Cotypes. (W. M., No. 13550.) 



Keokuk limestone, Monroe County, Illinois. 



10-12. Anterior, pedicle and brachial views of a nearly complete 

 specimen. Cotypes. (W. M., No. 7522.) 



Keokuk limestone, Spergen Hill, Indiana. 



13-14. Pedicle and brachial views of a nearly complete specimen. 

 Cotypes. (W. M., No. 13577.) 



Keokuk limestone, Salem, Indiana. 



Figs. 15-19. SPIRIFER MUNDULUS Rowley p. 333 



15-18. Pedicle, brachial, posterior and anterior views of a very per- 

 fect shell. Metatype. (R. R. R.) 



Burlington white chert, Louisiana, Missouri. 

 19. View of an incomplete pedicle valve. (W. M., No. 5635.) 

 Burlington limestone, near Springfield, Missouri. 



Figs. 20-24. SPIRIFER BRECKENRIDGENSIS n. sp p. 342 



20-22. Brachial, lateral and anterior views of a very perfect speci- 

 men. 23-24. Pedicle and posterior views of another specimen. 

 (D. K. G., No. 3302.) 



Chester Group, Breckenridge County, Kentucky. 



104 



