35 



Helicodiscus, 123. 

 Helisoma, 106. 

 Hemilastena, 76. 

 Heterogena 1 , 63. 

 Heterurethra, 113. 

 Hippeutis, 108. 

 Holopoda, 114. 

 Homogena?, 72. 

 Hydrobiina?, 92. 

 Hygrophila, 99. 



Lrevapex, 101. 

 Lampsilis, 64. 

 Lasmigona, 74. 

 Lastena, 73. 

 Limacidse, 121. 

 Umax, 121. 

 Lioplax, 89. 

 Lithasia, 95. 

 Lymnaea, 102. 

 Lymnseidse, 102. 

 Lymna'ime, 102. 



M 



Margaritana, 76. 

 Menetus, 108. 

 Mesogeme, 71. 

 Micromya, 64. 

 Monotremata, 110. 

 Musculium, 84. 



N 



Naiadacea, 63. 



O 



Obliquaria, 71. 

 Obovaria, 69. 

 Omphalina, lbs. 

 Opeas, 118. 

 Ortburethra, 110. 



Paludestrina, 94. 

 Patida, 122. 

 Pelecypoda, 63. 

 Philomycida', 121. 

 Philomycus, 121. 

 Physa, 99. 

 Physida?, 99. 

 Pierosoina, 107. 

 Pilea, 63. 

 Pisidium, 85. 

 Plagiola, 69. 

 Planorbella, 107. 

 Planorbina, 106. 

 Planorbina 1 , 106. 

 Planorbis, 106. 

 Planorbula, 10!). 

 Plethobasus, 77. 

 Pleurobema, 77. 

 Pleurocera, 96. 

 Pleuroceridas 95. 

 Polygyra, 114. 

 Polygyrina j , 114. 

 Poniatiopsinse, 95. 

 Pomatiopsis, 95. 

 Pressodonta, 75. 

 Prionodesmacea, 63. 

 Proptera, 68. 

 Prosobranchiata, 88. 

 Pseudohyalina, 120. 

 Pseudoon, 69. 

 Pterosygna, 75. 

 Ptychobranohus, 71. 

 Ptychogena*, 71. 

 Pulmonata, 99. 

 Punetime, 123. 

 Punctum, 123. 

 Pupidse, 110. 

 Papilla, 112. 

 Pupoides, 110. 

 Pyramidula, 122. 

 Pyrgulopsis, 95. 



Q 

 Quadrula, 78, 71). 



