112 
flelix appressa, Say, 31. 
arboreus, Say, 42. 
bucculenta, Gould, 29. 
var. rufa, Michener, 29. 
cellaria, Miill, 41. 
clausa, Say, 28. 
concava, Say, 36. 
demissa, Binn., 38. 
dentifera, Binn., 30. 
diodonta, Say, 27. 
electrina, Say, 42. 
fallax, Say, 32. 
fuliginosa, Griff., 37. 
gularis, Say, 38. 
hirsuta, Say, 34. 
hydrophila, Ingalls, 42. 
indentata, Say, 41. 
inflecta, Say, 33. 
tnornata, Say, 37. 
interna, Say, 39. 
introferens, Bld., 32. 
var. minor, 32. 
labyrinthica, Say, 46. 
levigata, Pfr., 37. 
ligera, Say, 37. 
lineata, Say, 48. 
minuscula, Binn., 43. 
minuta, Say, 44. 
minutissima, Lea, 48. 
monodon, Rackett, 33. 
palliata, Say, 30. 
Pennsylvanica, Green, 27. 
rufa, De Kay, 29. 
Sayiz, Binn., 27. 
striatella, Anth., 45. 
subplana, Binn., 38. 
suppressa, Say, 38. 
thyrotdes, Say, 28. 
tridentata, Say, 31. 
Hyalina, Fer., 4o. 
arborea, Say, 42. 
cellaria, Miill., 41. 
electrina, Gould, 42. 
hydrophila, Ingalls, 42. 
indentata, Say, 41. 
INOPERCULATA, 18-60. 
INDEX. 
Leucocheila, Alb. and Mart., 54. 
armifera, Say, 56. 
contracta, Say, 56. 
corticaria, Say, 57. 
fallax, Say, 56. 
marginata, Say, 55. 
pentodon, Say, 55. 
LIMACIDA, 21. 
Limax, Fer., 21. 
agrestis, Linn., 22. 
campestris, Binn., 23. 
carolinensis, Bosc, 19. 
flavus, Linn., 21. 
maximus, Linn., 23. 
Limnea, Lam., 62. 
caperatus, Say, 66. 
catoscopium, Say, 64. 
columella, Say, 63. 
desidiosa, Say, 65. 
elodes, Say, 64. 
humilis, Say, 65. 
macrostomus, Say, 63. 
reflexus, Say, 05. 
LIMNAZIDA, 61. 
LIMNOPHILA, 60. 
Limnophysa, Fitz., 64. 
caperata, Say, 66. 
catoscopium, Say, 64. 
desidiosa, Say, 65. 
elodes, Say, 64. 
humilis, Say, 65. 
reflexa, Say, 65. 
Lioplax, Troschel, 76, 
subcarinata, Say, 77. 
Macrocyclis, Beck, 36. 
concava, Say, 36. 
Margaritana, Schum., gI. 
margaritifera, Linn., 91. 
marginata, Say, 93. 
undulata, Say, 92. 
Melania, Lam., 83. 
altilis, Lea, 83. 
Melantho, Bowditch, 75. 
decisa, Say, 74. 
Menetus, H. B. Ad., 71. 
