LIST OP FIGURES. 



FIGURE. NAME. PAGE. 



1. Acmsea spectrum, Nutt 19 



2. Fissurella volcano, R\v 20 



3. Glyphis aspera, Esch 20 



' 4. Lucapina crenulata, by 21 



5. Fissurelidsea bimaculata, Ihill 21 



6. Acmsea spectrum, Nutt 21 



7. Acmsea patina, Esch 22 



8. Acmsea pelta, Esch 22 



9. Acmsea persona, Esch 22 



10. Acmsea mitra, Esch 22 



11. Lottia gigantea, Gray 23 



12. Ostrea Virginiana, Lister 30 



13. Mya arenaria, Linn 38 



14. Mya arenaria, Linn 39 



15. Ariolimax Columbianus, Old 45 



16. Helix Dupetitliouarsii, Desh 46 



17. Helix fidelis, Gray 47 



18. Helix Tryoni, Newc 47 



19. Glyptostoma Newberryanum, W. (\. I> 47 



20. Haliotisfulgens, Phil 51 



21. Haliotis Cracherodii, Leacli 55 



22. Haliotis rufescens, Swains 60 



23. Pecten latiauratus, Conr 64 



24. Pecten hastatus, Sby 66 



25. Pecten sequisulcatus, Cpr 67 



20. Hinnites giganteus, Gray 69 



27. Mytilus Calif ornianus, Conr 73 



28. Modiola recta, Conr 74 



197 



