135 



Helifodiscus, 123. 

 Helisoma, 106. 

 Hemilastena, 76. 

 Heterogena', 63. 

 Heterurethra, ll.'i. 

 Hippeutis, 108. 

 Holopoda, 114. 

 Honiogen;t?, 72. 

 Hydrohiina-, 92. 

 Hygrophila, 99. 



La'vapex, 101. 

 Lampsilis, 64. 

 Lasmigona, 74. 

 La.«tena, 73. 

 Limacid;r, 121. 

 Limax, 121. 

 Lioplax, 89. 

 Lithasia, 95. 

 Lymnica, 102. 

 Lymn;tida_', 102. 

 LymmeiiKc, 102. 



M 



3Iargaritana, 76. 

 Menetus, lOS. 

 Me.sogenii-, 71. 

 Micromya, 64. 

 JMonotremata, 110. 

 Musculium, 84. 



N 



Naiadaoea, 63. 



Obliquaria, 71. 

 Obovaria, 69. 

 Omphalina, 1 Is. 

 Opeas, 118. 

 Orthurethra, 110. 



Palude.etrina, 94. 

 Patula, 122. 

 Pelecypoda, 63. 



Philomycida\ 121. 



Philoniycu.s, 121. 



Physa, 99. 



Physidw, 99. 



Piero.soma, 107. 



Pi lea, 63. 



Pisidium, 8.5. 



Plagiola, 69. 



Planorbella, 107. 



Planorbina, 106. 



Planorbina', 106. 



PlanorV)is, 106. 



Planorbula, 109. 



Plethobasiifj, 77. 



Pleurobema, 77. 



Pleurocera, 96. 



Pleuroeerida^, 95. 



Polygyra, 114. 



Polygyrina-, 114. ' 



Pomatiopsitue, 9.5. 



Pouiatiopsis, 95. 



Pressodonta, 75. 

 Prionodesmacea, 63. 

 Pi-optera, 68. 

 Pro.sniiranchiata, 88. 

 Psendohyalina, 120. 

 Pseudoon, 69. 

 Pterosygna, 75. 

 Ptychobranchus, 71. 

 Ptyehogena>, 71. 

 Puhaonata, 99. 

 PuDctinse, 123. 

 PuDctum, 123. 

 Piipida>, 110. 

 Pupilla, 112. 

 Pupoides, 110. 

 Pyramidula, 122. 

 Pyrgulop.sis, 95. 



(inadrula, 78, 79. 



