198 LIST OF FIGURES. 



FIGURE. NAME. PAGE. 



29. Septifer bifurcatus, Rve 75 



30. Adulafalcata, Gld 75 



31. Surcula Carpenteriana, Gabb 76 



32. Goniobasis nigrina, Lea 79 



33. Goniobasis plicifera, Lea 79 



34. Physa heterostropha, Say 81 



35. Helisoma trivolvis, Say , 81 



36. Limnophysa palustris, Mull 82 



37. Limnxa stagnalis, Linn 82 



38. Anodonta Calif orniensis, Lea ; 83 



39. Anodonta angulata, Lea 85 



40. Olivella biplicata, Sby 87 



41. Psammobia rubro-radiata, Nutt 88 



42. Macoma secta, Conr 89 



43. Tapes staminea, Conr 90 



44. Saxidomus Nuttalli, Conr , 90 



45. Donax Californic-us, Conr 91 



46. Glycimeris generosa, Gld 92 



47. Lunatia Lewisii, Gld 93 



48. Littorina planaxis, Nutt 98 



49. Littorina scutulata, Gld 98 



50. Chlorostomafunebrale, A. Ad 98 



51. Chlorostoma brunneum, Phil. ... 99 



52. Calliostoma costatuiii. Mart. . 99 



53. Calliostoma, anmilatum, Mart 99 



54. Leptonyx sanguineus, Linn . 100 



55. Pomaulax undosus, Wood 101 



56. Trochiscus Norrisii, Sby ...?.; 101 



57. Cryptochiton Stelleri, Midd 104 



58. Tonicella lineata, Wood 104 



59. Stenoradsia Magdalenensix, lids 104 



60. Mopalia ciliata, Sby 105 



61. Mopalia lignosa, Gld 105 



62. Purpura saxicola, Val 105 



