164 



INDEX 



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



tryoni 74 



trjoniana 74 



vahlii 7^, 75 



wormskioldi (75) 



zrmanjae 61, 65 

 Lymnaeidaejp 

 Ljmnaeus (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) 

 Ljmnula (60) 

 Lymnus (60) 

 Lyogyrus 118 



granum jz8, 1 19 



lehnerti (117) 



MacrocycHs 33 



vancouverensis (34) 

 Macrophysa (100), lor 

 Margarita oregonensis (128) 

 Margaritana 131 



falcata Ij2 



margaritifera 11, J32 

 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 (iix) 



Muretia (ill) 

 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 isj 

 Nauta (104) 



hypnorum (106), (107) 



polaris (107) 

 Nautilina (83) 

 Nautilus crista (96) 



lacustris 97 

 Neritostoma jj, (61) 



Odostomia (115) 

 Oligolimax (36) 

 Omphalia (61) 

 OmphaloHmnus (61), 63 

 Omphiscola 60, (61), 62 

 Onchidella 112 



borealis 112, 113, 114 



carpenteri 113 



celtica 112, 113, 114 



floridana 114 

 Onchidiidae 112 

 Onchidium 112, 114, 115 



boreale (112) 



celticum 113 



nigricans 112 



schrammi 114 



typhae 112 

 Orbis (81) 

 Oreohelix 57 



cooperi 52 



itantoni 52 



strigosa 5/, 52 

 Oxyloma 55 



hungarica 55 



Pa^na (36) 



Paludina cincinnatiensis 118 



