PLATE XXVI. 



Pecten expansus Dall, view of right valve ; lat. 147 mm. ; p. 706. 



Pccten coosensis Shumard, view of right valve ; alt. 100 mm. ; p. 700. 



Pecten demiurgiis Dall, view of right valve ; alt. 71 mm. ; p. 718. 



Pinna caloosaensis Dall, interior view of part of left valve near ape.x ; Ion. 120 



mm. ; p. 660. 

 Pecten Stearnsii Dall, view of right valve ; alt. 71 mm. ; p. 706. 

 Pecten Madisonius var. Sayaniis Dall, view of right valve ; lat. 135 mm. ; p. 725. 

 Pecten fncanus Dall, view of mold of left valve ; alt. 85 mm. ; p. 704. 



921 



