164 



INDEX 



Lymnaea truncatula6o, 61, 62, 64, 72, 73 



tryoni 74 



tryoniana 74 



vahlii 7^, 75 



wormskioldi (75) 



zrmanjse 61, 65 

 Lymnseidsejp 

 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 (61) 

 Lymnula (60) 

 Lymnus (60) 

 Lyogyrus u8 



granum 118, 119 



lehnerti (117) 



Macrocyclis 33 



vancouverensis (34) 

 Macrophysa (100), 101 

 Margarita oregonensis (128) 

 Margaritana 131 



falcata 132 



margaritifera II, 132 

 Melania 117 



canaliculata (116) 



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 

 Mya complanata (133) 



margaritifera (132) 



radiata (126) 

 Myxas (104) 



Naiades 123 

 Nauta (104) 



hypnorum (106), (107) 



polaris (107) 

 Nautilina (83) 

 Nautilus crista (96) 



lacustris 97 

 Neritostoma 33, (61) 



Odostomia (115) 

 Oligolimax (36) 

 Omphalia (61) 

 Omphalolimnus (61), 63 

 Omphiscola 60, (61), 62 

 Onchidella 112 



borealis 112, 113, 114 



carpenteri 113 



celtica 112, 113, 114 



fioridana 114 

 Onchidiidae 112 

 Onchidium 112, 114, 115 



boreale (112) 



celticum 113 



nigricans 112 



schrammi 114 



typhae 112 

 Orbis (81) 

 Oreohelix 31 



cooperi 52 



stantoni 52 



strigosa 31, 52 

 Oxylomajj 



hungarica 55 



Pagana (36) 



Paludina cincinnatiensis 118 



