EXl-a.AXATIOX OF PI.ATE XXW'II. 



PiKNA LAijL'EATA Coiirad p. 4Iy 



I. Lateral view of a right valve, iiicomplele aiiterinrly. (After 

 Whitfield.) 



PlNN.\ RnSTRIFORMIS IMorlOll p. 4^0 



2-3, Lateral views nf two imperfect left A'alves. (After Whit- 

 field.; 



J'iiu'i'iitoi^'ii Iniu'saiiJ : Tiinbci- Creek. 



Geevii.liopsis enstfoioiis (Conrad) p. 421 



4. View of ail incomplete internal cast from the right side. 



Xavcsiiik marl: near FrecliuUI. (fjj). 



5. A similar ^■lew of a sma.lU'r specimen. 



.Wreesiiil: marl: Miilliea IIUl. (U'O'). 



956 



