EXPLANATION OF PLATE XL. 



Figs. 1-23. SPIRIFER LOUISTANENSIS Rowley p. 322 



1-5. Pedicle, brachial, lateral, anterior and posterior views of a 

 nearly complete specimen. 6-10. Similar views of another 

 specimen. 11-13. Brachial, lateral and posterior views of 

 another specimen. (W. M., No. 5632.) 



Chouteau limestone, Green County, Missouri. 

 14-15. Views of two pedicle valves. (W. M., No. 14153.) 



Head of Middle River, Callaway County, Missouri. 

 16-19. Pedicle, brachial, lateral and anterior views of a nearly per- 

 fect specimen. 20-23. Pedicle, brachial, lateral and posterior 

 views of a nearly perfect specimen. Metatypes. (R. R. R.) 

 Burlington white chert, Louisiana, Missouri. 



Figs. 24-29. SPIRIFER LEGRANDENSIS n. sp p. 326 



24-28. Pedicle, brachial, anterior, lateral and posterior views of a 

 very perfect specimen. 29. View of a pedicle valve. Cotypes. 

 (W. M., No. 10720.) 



Kinderhook, LeGrand, Iowa. 



Figs. 30-34. SPIRIFER INSCULPTUS Rowley p. 324 



Pedicle, anterior, posterior, lateral and brachial views of a nearly 

 perfect specimen. (W. M., No. 13551.) 



Base of Burlington limestone, Fern Glen, Missouri. 



96 



