164 



INDEX 



Lymnaea truncatula6o, 61, 62, 64, 7*, 73 



tryoni 74 



tryoniana 74 



vahlii 7^, 75 



wormskioldi (75) 



zrmanjae 61, 65 

 Lymnaeidsejp 

 Lymnaeus (60) 



columellus (70) 



emarginatus (68) 

 Lymnea (60) 



cornea (77) 

 Lymneus (60) 



caperatus (79) 



desidiosus (73) 



emarginatus (68) 



galbanus (73) 



humilis (73) 



megasomus (67) 



minutus (72) 



reflexus (77) 

 Lymnophysa (6l) 

 Lymnula (60) 

 Lymnus (60) 

 Lyogyrus 118 



granum 118, 119 



lehnerti (117) 



Macrocyclis 33 



vancouverensis (34) 

 Macrophysa ( 100) , 101 

 Margarita oregonensis (128) 

 Margaritana 131 



falcata fj2 



margaritifera n, 132 

 Melania 117 



canal iculnta (ll6) 



conica (116) 



plicifera (116) 



silicula (116) 

 Melantho decisa (125) 

 Menetus (81), 82, 86 



exacuous 91 



opercularis 92 

 Microphysa 99 



lansingi 44 



pygmaea (53) 



stearnsii (44) 

 Mouretia (ill) 



Muretia (in) 

 Musculium jayanum 139 



lenticula 140 



partumeium 139 



raymondi 138 



tenue 139 



transversum 139 



truncatum 140 

 My a complanata (133) 



margaritifera (132) 



radiata (126) 

 Myxas (104) 



Naiades t2j 

 Nauta (104) 



hypnorum (106), (107) 



polaris (107) 

 Nautilina (83) 

 Nautilus crista (96) 



lacustris 97 

 Neritostoma .55, (61) 



Odostomia (115) 

 OHgolimax (36) 

 Omphalia (61) 

 Omphalolimnus (6l), 63 

 Omphiscola 60, (61), 62 

 Onchidella tiz 



borealis //.?, 113, 114 



carpenteri 113 



celtica 112, 113, 114 



floridana 114 

 Onchidiidae 112 

 Onchidium 112, 114, 115 



boreale (112) 



celticum 113 



nigricans 112 



schrammi 114 



typhse 112 

 Orbis (81) 

 Oreohelix j/ 



cooperi 52 



etantoni 52 



strigosa 57, 52 

 Oxyloma/5 



hungarica 55 



Parana (36) 



Paludina cincinnatiensis 118 



