EXPLANATION OF PLATE XI 

 All figures approximately natural size unless otherwise stated 



Fig. 1. Admete stavitoni (Dickerson) p. 40 



Fig. 2. Crepidula dickersoni n. sp. p. 31 



Fig. 3. Fissuridea stillwaierensis n. sp. p. 27 



Fig. 4. Nerita was king toniana n. sp. x 3 p. 28 



Fig. 5. Admete stantoni (Dickerson) p. 40 



Fig. 6. Fissuridea stillwatcrensis n. sp. Apical view __' p. 27 



Fig. 7. Admete evulsa (Solander) Specimen from the Paris Basin. 



(Cornell University Museum Collection) p. 41 



Fig. 8. Sinum occidentis n. sp. p. 32 



Fig. 9. Hydrobia pontis n. sp. x 3 p. 33 



Fig. 10. Eratopsis crescentensis n. sp. x 3 p. 36 



Fig. 11. Hydrobia pontis n. sp. x 3 p. 33 



Fig. 12. Littorina mounts oloensis n. sp. x 2 p. 30 



Fig. 13. Goniobasis olequahensis n. sp. x 2 p. 45 



Fig. 14. Ficopsis remondii (Gabb) var. crescentensis n. var p. 39 



Fig. 15. Urosalpinx merriami n. sp. p. 39 



Fig. 16. Syrnola vaderensis n. sp. x 3 p. 29 



Fig. 17. Syrnola vaderensis n. sp. x 3 Another specimen p. 29 



Fig. 18. Galeodea tuberculata Gabb var. crescentensis n. var. p. 37 



Fig. 19. Epitonium washingtonensis n. sp p. 30 



Fig. 20. Galeodea tuberculata Gabb var. crescentensis n. var. p. 37 



Fig. 21. Harpa crescentensis n. sp. x 3 p. 40 



Fig. 22. Eratopsis crescentensis n. sp. x 2 p. 36 



Fig. 23. Galeodea tri-tuberculata (Weaver) --P- 37 



Fig. 24. Crepidula stillwaterensis n. sp. P- 31 



Fig. 25. Moniliopsis fryei n. sp. x 3 P- 42 



Fig. 26. Sinum occidentis n. sp. P- 32 



Fig. 27. Galeodea tri-tuberculata (Weaver) p. 37 



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