INDEX. 



Menetus exacutus, Say, 71. 

 Mesodon, Raf., 26. 



albolabris, Say, 26. 



bucculenta, Gould, 29. 

 var. rufa, Michener, 29. 



clausa, Say, 28. 



dentifera, Binn., 30. 



Pennsylvanica, Green, 27. 



palliata, Say, 30. 



Sayii, Binn., 27. 



thyroides, Say, 28. 

 MOLLUSCA, 13. 

 My a complanatus, Solander, 86. 



margaritifera, Linn., 92. 

 Mytilus fluvialis, Dillw., 93. 



OPERCULATA, 74. 



Pallifera, Morse, 20. 



dorsalis, Binn., 20. 

 Paludina decisa, Say, 75. 



dissimilis, Say, 84. 



grana, Say, 80. 



limosa, Say, 79. 



lustrica, Say, 82. 



Nickliniana, Lea, 8l. 



subcarinata, Say, 77- 

 Patula, Hald., 45. 



striatella, Anth., 45. 

 PECTINIBRANCHIATA, 74. 

 PHILOMYCID^E, 18. 

 Philomycus, 20. 



dorsalis, 20. 

 Physa, Drap., 66. 



ancillaria, Say, 66. 



gyrina, Say, 67. 



heterostropha, Say, 67. 



hypnorum, Linn., 68. 



lata, Tryon, 68. 

 Pisidium, Pfr., 101. . 



abditum, Hald., 103. 



compression, Prime, 101. 



variabile, Prime, 102. 



virginicum, Gmel., 102. 

 Planorbella, Hald., 69. 



campanulatus, Say, 69. 



10* 



Planorbis, Mull., 69. 



albus, Mull., 72. 



armigerus, Say, 73. 



bicarinatus, Say, 70. 



campanulata, Say, 69. 



deftectus, Say, 71. 



dilatatus, Gould, 72. 



exacutus, Say, 71. 



parvus, Say, 72. 



trivolvis, Say, 70. 



vzr.fallax, Hald., 70. 

 Planorbula, Hald., 72. 



armigera, Say, 73. 

 Pomatiopsis, Tryon, 81. 



lapidaria, Say, 82. 



lustrica, Say, 82. 

 Pseudo-hyalina, Morse, 43. 



minuscula, Binn., 43. 



PULMONIFERA, 1 8. 



Punctum, Morse, 48. 



minutissimum, Lea, 48. 

 Pupa armifera, Say, 56. 



contracfa, Say, 56. 



corticaria, Say, 57. 



decora, Gould, 58. 



exigua, Say, 60. 



fallax, Say, 56. 



Gouldii, Binn., 59. 



milium, Gould, 59. 

 PUPAD^E, 51. 



Radix, Montf., 62. 



columella, Say, 63. 

 macrostoma, 63. 



ROSTRIFERA, 74. 



Somatogyrus, 82. 



altilis, Lea, 83. 

 Sphaerium, Scop., 96. 



fabalis, Prime, 99. 



partumeium, Say, 100. 



rosaceum, Prime, 100. 



securis, Prime, 101. 



simile, Say, 98. 



stamineum, Con., 99. 



striatinum, Lam., 98. 

 j transversum, Say, 97. 



H 



