114 INDEX. 
Stenotrema, Raf., 33. Unio radiatus, Lam., 87. 
hirsuta, Say, 34. Tappanianus, Lea, 89. 
monodon, Rackett, 33. undulatus, Say, 92. 
STREPOMATIDA, 83. UNIONID, 86. 
Strobila, Morse, 46. 
labyrinthica, Say, 46, Vallonia, 43. 
Succinea, 50. minuta, Say, 44. 
avara, Say, 51. var. costata, Say, 44. 
obliqua, Say, 50. Valvata, Miill., 78. 
ovalis, Gould, 50. tricarinata, Say, 78. 
SUCCINID, 49. VALVATIDA, 77. 
Vertigo, Miill., 57. 
Tebennophorus, Binn., rg. decora, Gould, 58. 
carolinensis, Bosc, 19. Gouldii, Binn., 59. 
Tellina virginica, Gmel., 102. milium, Gould, 59. 
Triodopsis, Raf., 30. ovata, Say, 57. 
appressa, Say, 31. pentodon, Say, 55. 
fallax, Say, 32. VIVIPARIDA, 74. 
inflecta, Say, 32. 
introferans, Bland, 32. Zonites, 37. 
var. minor, Bland, 32. demissus, Binn., 39. 
tridentata, Say, 31. fuliginosus, Griff., 37. 
gularis, Say, 39. 
Unio, Retz, 86. inornatus, Say, 38. 
cariosus, Say, 88. internus, Say, 39. 
complanatus, Sol., 86. leevigatus, Pfr., 38. 
Fisherianus, Lea, go. | ligerus, Say, 39. 
heterodon, Lea, 91. | subplanus, Binn., 38. 
nasutus, Say, 90. suppressus, Say, 40. 
ochraceus, Say, 89. Zua, Leach, 52. 
purpureus, Say, 86. lubricoidea, Stimp., 52. 

THE END. 
