Till 



SYSTEMATIC INDEX. 



Paok 



Cocliliopa, Stimp. 72 

 '30. Cochliopa rowellii, Tryon. 73 



8oiuatogyrus, Gill. 76 



34. Somatogyrus depressus, 



Tryon. 77 



35. Somatogyrus isogonus, Say. 



77 



36. Somatogyrus integer, 5a^. 79 



Page 

 CYCLOPHORID^. 95 



Amuicola, Gld. & Hald. 



37. Amnicola sayana, Anth. 



38. Amnicola porata, Say. 



39. Amnicola pallida, Hald. 



CYCLOSTOMINiE. 



95 



40. Amnicola limosa, Say. 



41. Amnicola decisa, llald. 



42. Amnicola cincinnatensis, 



Anth. 85 



43. Amnicola granum. Say. 86 



44. Amnicola parva, Lea. 87 



45. Amnicola orbiculata, iea. 87 



46. Amnicola longinqua. Gld. 87 



Fluiniiiicola, Stimp. 89 



47. Fluminicolanuttalliana,Z/e(7. 



89 



48. Fluminicola virens. Lea. 91 



49. Fluminicola fusca, Hald. 92 



Poiiiatiopsis, Tryon. 93 



50. Pomatiopsis lapidaria. Say. 



93 



51. Pomatiopsis lustrica. Say. 94 



Clioiidroponia, Pfk. 95 



52. Chondropoma dentatum, 



Say. 96 



TRUXCATELLID^. 97 



Triincatella, Risso. 97 



53. Truncatella caribaeensis. 



Sow. 98 



54. Truncatella bilabiata,7yr. 99 



55. Truncatella pulchella,/yr. 99 



56. Truncatella subcylindrica, 



Gray. 100 



57. Truncatella californica, Pfr. 



100 



]VERITII>iE. 100 



Neritella, Humph. 101 



58. Neritella reclivata, Say. 103 



59. Neritella californica. Eve. 104 



60. Neritella cassiculum. Sow. 



105 



61. Neritella picta, Sow. 105 



62. Neritella sho'walteri,Ze«.106 



IIELICIIVIDJB. 



107 



Helicina, Lam. 107 



OUgyra, Say. 108 



63. Helicina orbiculata, Say. 108 



64. Helicina hanleyana, Pfr. 110 



65. Helicina chrysocheila,finin. 



110 



66. Helicina subglobosa, Poey. 



Ill 



67. Helicina occulta, Say. Ill 



68. Helicina ? 116 





