INDEX OF GENERA, AND SPECIES. 



ACEPHALA, 85. 



Acicula, 54. 



acicula, Mull., 54. 

 Alasmodonta, Say, 91. 



arcuata, Barnes, 91. 



edentula, Say, 95. 



marginata, Say, 93. 

 Amnicola, Gould and Hald., 79. 



decisa, Hald., 80. 



grarfa, Say, 80. 



limosa, Say, 79. 

 AMNICOLID^E, 79. 

 Anodon, Cuvier, 93. 



edentula, Say, 95. 



fluviatilis, Dill, 93. 



implicata, Say, 93. 



Tryonii, Lea, 95. 



undulata, Say, 94. 

 Anculosa, Say, 84. 



dissimilis, Say, 84. 

 Ancylus, Geoff., 73. 



rivularis, Say, 73. 



tardus, Say, 74. 

 Anguispira, Morse, 34. 



alternata, Say, 35. 

 AURICULID^:, 60. 



BRANCHIFERA, 85. 

 Buccinum, Linn., 54. 



acicula, Mull., 54. 



virginicum, Gmel., 84. 

 Bulimus, 52. 



lubricoides, Stimp., 52. 



lubricus, Say, 52. 

 Bulinus, 68. 



hypnorum, Linn., 68. 

 Bythinella, Moq., Tand., 80. 



Nickliniana, Stimp., 81. 



Carychium, Gray, 60. 

 exiguum, Say, 60. 



CORBICULID^E, 96. 



Cyclas, Burg., 97. 



fabalis, Prime, 99. 



partumeium, Say, loo. , 



rosaceum, Prime, 100. 



securis, Prime, IOI. 



similis, Say, 98. 



stamineum, Con., 99. 



striatinurti, Lam., 98. 



transversum, Say, 97. 

 Cyclostoma, Mont., 55. 



lapidaria, Say, 82. 



marginala, Say, 55. 



tricarinata, Say, 78. 



GASTEROPODA, 15. 

 GEOPHILA, 18. 

 Goniobasis, Lea, 83. 



virginica, Gmel., 84. 



var, multilineata, Say, 84. 

 Gyraulus, Agass., 71. 



albus, Mull., 72. 



deflectus, Say, 71. 



dilatatus, Gould, 72. 



parvus, Say, 72. 



HELICID^E, 24. 

 Helicodiscus, Morse, 47. 



lineatus, Say, 48. 

 Helisoma, Swain, 69. 



bicarinata, Say, 70. 



trivolvis, Say, 70. 



var. fallax, Hald., 70. 

 Helix, Linn., 26. 



albolabris, Say, 26. 



alternata, Say, 35. 



Ill 



