EXPI.AXATION OF PLATi; LXXXX'IL 



P\'l((il'SlS TKdCIIIlMlKMIS ( TuunU'V ) p. 746 



1-3. Tw'ci lateral \icws ami a \'ertical \ iew of a. specimen illus- 

 lr;iteil liy Whitfield as P. rcilcyi. 

 Xii-X'csiiil; iiitirl : llnliiidcl. 

 4-6. Twei lateral \ae\\'s nf niie specimen a.nil a \-ertical \'iL'\\" nf 

 another indixadiial. 



Xii'i'i-siiil: iiuirl: Miillifu 1 1 ill, (760). 

 7-9. Two lateral \ iews a.nd a \ertical \ iew of a specimen ilhis- 

 trated hy Wdiilfield as P. ricliardsoiii. 



X'jvcsink iiiiirl: MtuiiiKnilh Cmiii/y. 



10. Lateral view of a specimen partialK' prcscrxdng" the shell. 



MarshaUtuwn clay-iiuiyl : near Si^'cdcsborn. [177). 



11. I^ateral view of a specimen illustiaaleil h>' Wliit'ield fiarlially 



pres(.'i'\an'.'; llie exlernrd chai'acters. 

 Xax'csuik marl. 



105S 



