Stagnicola bulimoides 79 



caperata 79 



catascopium 77 



communis (76) 



emarginata 68 



palustris 76 



perpolita 78 



reflexa 77 

 Stenotrema germanum (25) 

 Strepomatidoe iib 

 Striatura milium (43) 

 Strobila labyrinthica ZJ 

 Strophitus izj 



edentulus (127) 



rugosus I2J 

 Succinea (55), J^, 71. 'OS 



alaskana 58 



annexa (59) 



aurelia (59) 



avara 55, 56, sj 



campestris (58) 



chrysis 10, 59 



decampi (56) 



dunkeri 55 



elegans 55 



greeri (58) 



gionlandica57 



grosvenori 57 



hawkinsi57 



hajdeni (56) 



lineata (59) 



minor (56) 



nuttalliana _jS 



obliqua j5 



oblonga 55 



oregonensis ^6 



ovalis55, (56), {58), 59 



pfeifteri 55 



putris 55 



retusa (56), 57, 58 



rusticana^S 



sillimani 57 



totteniana 55 



vermeta (57) 



verrilli 57 



wardiana (57) 

 Succineids55 

 Succinia (55) 

 Symphynota 131 



Symphynota complanata ijl 



costata /J/ 



katherinae 131 

 Syncoryne 1S3 



eximia 177, 1S4, 210 



Tanousia (5i), 62, 65 



Tapada (55) 



Taphius (Si), 85 



Teba (39) 



Tellina henslowana (145) 



virginica (141 ) 

 Thuiaria 202 



argentea 177, 202-203 



coei 177, 203, 234 



costata 177, 205, 234 



cupressoides 177, 20S 



elegans 177, 205, 232 



fabricii 177, 203-204, 230 



gigantea 177, 204 



similis 177, 203 



thuiarioides 177, 204 



turgida 177, 204, 232 



variabilis 177, 20J 

 Torquis 83, S5 



arcticus 96 



nathorsti 96 



parvus 95 



umbilicatellus 96 



vermicularis 95 

 Trimusculus ( 1 1 1 ) 

 Trociiilus mortoni 40 

 Trochlea (83) 

 Trochovitrina (36) 

 Trochula 40 

 Trochulus (40) 



trochiformis (41) 

 Trochus (39) 



terrestris (40) 

 Trophidiscus (82) 

 Tropidina (120), 121 

 Tropidiscus (81), 82, 85 

 Tropidocyclas henslowana 145 

 Truella (55) 



elongata 55 

 Tubularia 1S6 



borealis 187 



elegans 1S7 



harrimani 177, 186, 214 



