159 



Bifidaria holzingeri 28 



pentodon £8 

 Bornia 141 

 Brachvspira (55) 

 Brondelia 109 



drouetiana 109 

 Buccinuin palustre 62, (76) 



truncatiilum 62, (72) 

 Bulimiiuis obscurus 41 

 Biilimnea (60), 63 



nicgasoma 67, 70 

 Bulimiilus pilula 79 

 Biilimus (104), 105, (115) 



harpa (21) 



hjpnorum ( 106) 



lubricoides (33) 

 Biilimis (100), (loi), (104), 105, 107 



horjaceiis (104) 



hvpnorum 107 



peria 105 



pictus 107 



senegalensis 105 



turrit us 105 

 Bulla (104) 



fontinalis 99, 100 



hvpnorum 104, 105. (106) 



turrita (106) 

 Bullinus (100), {104) 



fontinalis 100 



turritus (106) 

 Bvthinella obtusa 1 18 

 Bvthinia 105 



Caillaudia (81) 



angulata 81 

 Cainpeloma 12^ 



decisum 124, 125 

 Carinifcx 63 

 Carychium 7/5, 116 



exiguum 115, 116 



exile 116 



minimum 1:5 

 Cepa;a hortensis (20) 

 Chilostoma (22) 

 Chlamydca 36 

 Choanomphalus 62 

 Cincinna (120) 



Cincinnatia cincinnatiensis I18 

 Cionella lubrica (33) 



Circinaria (22), 33 

 chocolata 34 



hemphilli 35 



hybridajj 



sportella 34, J5 



vancouvcrcnsis 25, J^, (35) 



vovana 35 

 Circinariidoe 33 

 Cobresia (3S), 121 

 Cochlicopa jj 



lubrica jj 

 Cochlohydra (55) 

 Complanaria gigas (131) 

 Conciniia (120) 

 Conulus (39) 



alaskensis 41 



arcticus (45) 



chersiiuis {41) 



fulvus (40), (41) 



trocliiformis (41) 

 Corctus (80), (Si), S3 

 Corniotvclas 3, 134, 141 



abdita 142, 143, 145 



abyssorum I4J 



sequilaleralis i^ 



arctica 144 



boreal is J44 



compressa /^l 



glacialis 144 



henslowana /^j' 



idahoensis 141 



nivalis 744 



occidentalis 14J 



pulchella J44 



randolpbi 144 



rotundata /4J 



scutcllata 141 



sibirica 144 



sleenbuchii 14J 



ultramontana 144 



variabilis 142 



ventricosa 14^ 



virginica /4I 

 Cornu (81) 

 CostatcUa (100), lor 

 Costella (100) 

 Cumingia (108) 

 Cyclas appendiculata (145) 



aurea ( 135) 



