PLATE XXXIV. 



Fig. i. Pec ten coccy in f fits Dall, left valve ; alt. 30 mm. ; p. 741. 



Fig. 2. Pecten cactaceits Dall, right valve, the cars restored from a smaller one ; alt. 



28 mm. ; p. 716. 



Fig. 3. Pcctfn indecism Dall, right valve ; alt. 16.5 mm. ; p. 744. 

 Fig. 4. Pecten scissuratus Dall, left valve ; lat. 30111111. ; p. 715. 

 Fig. 5. Pecten compactus Dall, right valve ; lat. 26 mm. ; p. 707. 

 Fig. 6. Glycymcris dnplincnsis Dall, interior of left valve ; alt. 10 mm. ; p. 613. 

 Fig. 7. The same valve, exterior view ; p. 613. 

 Fig. 8. Pcctcn Hiirnsii Dall, right valve ; lat. 19 mm. ; p. 720. 

 Fig. 9. Pecten watftubbeanus Dall, left valve ; alt. 17.5 mm.; p. 736. 

 Fig. 10. Pcctcn aliimensis Dall, left valve; alt. 8.5 mm. ; p. 740. 

 Fig. ii. The same, right valve ; p. 740. 

 Fig. 12. Pcctcn Gnppyi Dall, right valve ; p. 718. 

 Fig. 13. The same, left valve ; lat. 5 mm. ; p. 718. 

 Fig. 14. Pcctcn condyloniatus Dall, left valve ; lat. 24 mm. ; p. 729. 

 Fig. 15. The same in profile, showing undulations ; p. 729. 

 Fig. 16. Oryctoinya clailwi-ncnsis Dall, left valve ; Ion. 27 mm. 

 Fig. 1 6 a. The same, pustular sculpture enlarged; Claibornian ; Nautilus, xi., p. 135, 



April, 1898. 



Fig. 17. Area callicestosa Dall, sculpture magnified ; p. 638. 

 Fig. 18. The same, exterior of left valve ; 32 mm. ; p. 638. 

 Fig. 19. Thracia Dilleri Dall ; from Eocene of Oregon ; Ion. 48 mm. ; Arago beds near 



Coos Bay, Oregon. 



Fig. 20. Yoldia psammotcea Dall, left valve ; Ion. 21 mm. ; p. 596. 

 Fig. 21. Pecten centrotus Dall; lat. 19.5 mm. ; p. 733. 

 Fig. 22. Pecten cugrammatus Dall, right valve ; lat. 20 mm. ; p. 712. 

 Fig. 23. Pcctcn cocihiiuis Dall, left valve ; alt. 23.5 mm. ; p. 738. 

 Fig. 24. Pcctcn Harrisii Dall, left valve of a slightly distorted specimen ; lat. 31 mm. ; 



p. 742. 



929 



