EXPLANATION OF PLATE LXVI. 



FigS. 1-5. PSEUDOSYRINX GIGAS n. Sp p. 410 



Anterior, posterior, lateral, pedicle and brachial views of the holo- 

 type, a nearly complete specimen. (W. M., No. 12805.) 

 Keokuk (?) , Kentucky. 



Figs. 6-10. PSEUDOSYRINX KEOKUK n. sp p. 408 



Posterior, anterior, brachial, pedicle and lateral views of a nearly 

 complete internal cast. (W. M.. No. 5634.) 

 Residual chert, Springfield, Missouri. 



Figs. 11-13. PSEUDOSYRINX MISSOURIENSIS n. sp p. 406 



11. View of the cardinal area of an incomplete pedicle valve. 12. 

 Lateral view of an incomplete pedicle valve. (W. M., No. 

 13967.) 



Burlington white chert, Louisiana, Missouri. 



13. View of the cardinal area of an incomplete pedicle vn'.ve. 

 (W. M., No. 13559.) 



Burlington limestone, Osccola, Missouri. 



148 



