EXPLANATION OF PLATE XLVII. 



Figs. 1-5. SPIRIFER CRAWFORDSVILLENSIS n. sp p. 338 



Pedicle, brachial, lateral, posterior and anterior views of the holo- 

 type. (W. M., No. 13528.) 



Crawfordsville shale, Crawfordsville, Indiana. 



Figs. 6-16. SPIRIFER BIFURCUTUS Hall p. 346 



6-8. Pedicle, posterior and lateral views of a nearly complete speci- 

 men. 9-10. Views of two pedicle valves. (W. M., No. 14784.) 



Salem limestone, Hull's Hollow, near Alton,, Illinois. 

 11-14. Pedicle, brachial, anterior and lateral views of a nearly 

 perfect specimen. 15-16. Brachial and lateral views of another 

 specimen. (W. M., No. 7530.) 



Salem limestone, Spergen Hill, Indiana. 



Figs. 17-31. SPIRIFER LEIDYI Norwood and Pratten p. 345 



17-19. Pedicle, brachial and anterior views of a very perfect speci- 

 men. 20-22. Brachial, posterior and lateral views of a large 

 specimen. 23-27. Pedicle, brachial, anterior, posterior and lat- 

 eral views of a perfect specimen. 28-29. Pedicle and brachial 

 views of another example. 30-31. Lateral and brachial views 

 of a nearly perfect specimen. (W. M., No. 7511.) 

 Chester Group, Chester, Illinois. 



110 



