13() 



Radix, 102. 

 Rhipidoglossa, 88. 

 Rotundaria, 81. 

 Rugifera, 75. 



Scalenaria, B3. 

 Segmentina, 109. 

 Sigmurethra, 114. 

 Somatogyrus, 94. 

 SphHTiidw, 82. 

 Sph:i-rium, 82. 

 Sphyradiuui, 123. 

 Stagnicola, 104. 

 Stenotrema, 117. 

 Strobilops, 110. 

 Strophitus, 71. 

 Stylommatophora, 1 10. 

 Succinea, 113. 

 Succlneida-, 113. 

 Symphyiiota, 74. 



Ta'iiioglossa, 88. 

 Teleodesmacea, 82 

 Testacella, 118. 

 Testacellida-, 118. 

 Tetragena-, 78. 



Tlieliderraa, TJ. 

 Torquis, 108. 

 Triodopsis. 114. 

 Tritogonia, 70. 

 Truncilla, 63. 



U 



Unio, 76. 



Uniomerus, 77. 

 I'nionid;!.', 63. 



Vallonia, 110. 

 Valloniida", 110. 

 Valvata, 91. 

 Valvatid:f, 91. 

 Vasopulmonata, 110. 

 Vertigo, 112. 

 Vertigopsis, 112. 

 Vitrea, 119. 

 Vitrina, 119. 

 Vivipara, 88. 

 Viviparidas 88. 



Zonitidiv, 118. 

 Zonitimf, 118. 

 Zonitoide:?, 120. 



