EXPLANATION OF PLATE LV. 



Figs. 1-8. SPIRIFER GREGERI n. sp p. 359 



1-2. Views of two pedicle valves with the shell partially removed. 

 3. Posterior view of another specimen. Cotypes. (W. M., 

 No. 13552.) 



Summit of Choutcau limestone, Scdalia, Missouri. 

 4. View of a pedicle valve retaining the shell. Cotype. (W. M., 

 No. 13578.) 



Upper Chouteau, Head of Middle River, Callaway Co., 



Missouri. 



5-8. Pedicle, brachial, lateral and anterior views of a nearly 

 complete small specimen. (D. K. G., No. 3401.) 



Chouteau limestone, Newark, Knox County, Missouri. 



Fig. 9. SPIRIFER MONTGOMERYENSIS n. sp p. 367 



View of a pedicle valve, the holotype. (W. M., No. 13330.) 

 Kcokuk, Crawfordsi'illc, Indiana. 



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