Index 



211 



Showalteri (Neritina) Lea 38, 



Showalteri (Physa) Lea 113, 



Showalteri (Schizostoma) Lea 



Sibiricum (Pisidium) West 



Silicula (Goniobasis) Gld 



Similis (Goniobasis) Lea 



Simpsonaias Fr 



Simpsoni (Lampsilis) Ferriss 



Simpsoni (Pleurobema) Van 



Simpsonia Baker 



Sinipsoniconcha' Fr 55, 64, 



Sincera danielsi (Valvata) Walk 



Sincera nylanderi (Valvata) Dall 



Sincera utahensis (Valvata) Call 



Singleyi (Eupera) Pils 



Sintoxia (Obliquaria) Raf 



Sinuata (Obliquaria) Raf 



Sinuosus (Planorbis) Bonnet 



Smithii (Neoplanorbis) Walk 



Smithsoniana (Goniobasis) Lea 



Smithsoniana (Physa) Lea 1 10, 



Solenoides (Unio) Raf 



Solida (Lymnxa) Lea 



Solida (Lymnaea) Phil 



Solida (Pompholyx) Dall 



Solida (Quadrula) Lea 



Solidum (Sphjerium) Norm 



Somatogyriis Gill 31, 32, 



Southalli (Cokeria) Marshall 84, 



Sparsestriata (Physa) Tryon 1 10, 



Sparus (Goniobasis) Lea 



Sphseriastrum Bgt 



Sphaerica (Quadrula) Lea 



Sphsriidae 39, 85, 



Sph;erium Scop 85, 188, 



Spillmani (Strephobasis) Lea 149, 



Spillmani (Trypanostoma) Lea 



Spillmanii (Campelonia) Lea 



Spillmanii (Lioplax) Tryon 



Spillmanii (Paludina) Lea 



Spinosa (lo) Lea 35, 



Spinosa (Pyrgulopsis) C. and P 



Spinosus (Potamopyrgus) C. and P 



Spinosus (Unio) Lea 



Stagnalis (Lymnaea) L 



Stagnicola Leach '. . 



Stagnalis appressa (Lymnaea) Say 



Stagnicolum .(Sphaerium) Sby 



Stearnsiana (Goniobasis) Call 



Stearnsiana (Paludestrina) Pils 



Stegaria (Obovaria) Raf 



Stelmophora (Vivipara) Stearns 



Stewardsoni stevensoni (Unio) DeG 



Stimpsonia (Zless 136, 



Stimpsoniana (Gundlachia) S. Sm 



Strengi (Somatogyrus) P. and W 



Strephobasis Lea 36, 149, 



Streptoneura 23, 



Striata (Obliquaria) Raf 



Striata (Physa) Lea 



Striata (Valvata) Lewis 



Striatus (Unio) Goldfuss 



Striatus (Unio) Lea 



Strophitus Raf '.55, 56, 176, 



Subarata (Physa) Mke 



164 

 114 

 163 

 189 

 160 

 161 

 178 

 184 

 173 



93 

 178 

 131 

 131 

 132 



88 

 169 

 175 

 103 

 123 

 161 

 114 

 166 



93 



93 

 105 

 166 

 199 

 142 

 187 

 114 

 158 

 199 

 :69 

 188 

 199 

 154 

 153 

 129 

 129 

 129 

 199 

 140 

 140 



52 

 7 

 6, 9 

 7 

 1 88 

 161 

 139 

 179 

 126 

 186 

 138 

 121 

 M5 

 153 

 123 

 180 

 109 

 131 

 173 

 173 

 199 

 107 



Subcarinata (Limnrea) Say 26 



Subcrenatus (Planorbis) Cpr 100, 104 



Subcrenatus disjectus (Planorbis) Coop. . 103 



Subcylindracea propexilis (Anodonla) DeG. 176 



Subglobosa (Anculosa) Say 164 



Subglobosa (Congeria) Partsch 84 



Subglobosus (Somatogyrus) Say ....144, 145 



Sublirata (Goniobasis) Con 155 



Submytilacea 39> i6s 



Suborbiculata (Anodonta) Say 176 



Subplanus (Unio) Con 51, 174 



Subrhombica (Goniobasis) Lea 161 



Subrobustum (Pleurocera) Lea 153 



Subrobustum (Trypanostoma) Lea 153 



Subrostrata (Lampsilis) Say 184 



Subrotunda (Obliquaria) Raf )8o 



Subrotunda (Physa) Sby 114 



Subrotunda (Quadrula) Lea 167, 169 



Subrotunda leucogone (Fusconaia) Ort. . . 169 



Subrotundus (Ancylus) Tryon it8 



Subrotundus (Lanx) Tryon 117, 118 



Subsolidum (Campeloma) Anth. 



25, 127, 128, 129 



Substriatus (Somatogyrus) Walk 146 



Subtentus (Ptychobranchus) Say 67, 179 



Subteritus pulchreornatus (Unio) DeG. .. 179 



Subulare (Pleurocera) Lea 151 



Subviridis (Unio) Con 177 



Sulcata (Goniobasis) Lea 161 



Sulcata (Truncilla) Raf 186 



Sulcatum (Sphsrium) Lam 86 



Sulcatus (Unio) Lea 8i 



Sulcularia Raf 177 



Supinum (Pisidium) A. Schmidt 200 



Symmetrica (Goniobasis) Hald 160 



Symphynota Lea 177 



Symphynota Simp 177 



Tsniata (Anculosa) Con 164 



Taenioglossa 23, 123 



Tantillus (Neoplanorbis) Pils 22, 123 



Tantillus (Planorbis) Hink 123 



Tappanianus (Unio) Lea 177 



Tarda (Ferrissia) Say 120 



Tardus (Ancylus) Say 120 



Tecomensis (Unio) DeG 182 



Tellicoensis (Pleurobema) Lea '. 171 



Tellini (Horatia) Poll 33 



Tenebrosa (Goniobasis) Lea 162 



Tenebrosa (Melania) Lea 162 



Tenera (Lampsilis) "Rav." Mazyck 184 



Tenerus (Lampsilis) "Rav." Mazyck .... 184 



Tennesseensis (Somatogyrus) Walk 146 



Tentaculata (Bythinia) L 132 



Tentaculata (Helix) L 28 



Tenuis (Planorbis) Phil 103 



Tenuissima (Physa) Lea 114 



Terebrale (Pleurocera) Lea 153 



Terebrale (Trypanostoma) Lea 153 



Teres (Unio) Raf 181 



Terrae-novae (Valvata) Fer 131 



Tetragenae Simp. 170 



Tetralasmus (Unio) Say 53 



Texana (Hydrobia) Pils 140 



Texasensis (Unio) Lea 180 



