INDBX 



243 



Lyogyrus lehnerti (117) 



Macrocyclis 33 



vancouverensis (34) 

 Macrophysa (100), loi 

 Margarita oregonensis (128) 

 Margaritana 131 ^js-^""^ 



falcata 132 '~' 



margaritifera 11, 132 

 Melania 117 



canaliculata (116) 



conica (116) 



plicifera (116) 



silicula (116) 

 Melantho decisa (125) 

 Menetus (81), 5^,86 



exacuous 91 



opercularis 92 

 Merriam, C. Hart, preface v 

 Microphjsa 99 



lansingi 44 



pjgmaea (53) 



stearnsii (44) 

 Mollusks 1-17 1 



bibliography I47-I53 



fresh water shells, distribution 1-6. 



9-15 



genera and species, systematic dis- 

 cussion 19-145 



land shells, distribution 7-15 



plates and plate descriptions 154, 

 156 

 Mouretia (iii) 

 Muretia (iii) 

 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 12^ 

 Nauta (104) 



hypnorum (106), (107) 



Nauta polaris (107) 

 Nautilina (83) 

 Nautilus crista (96) 



lacustris 97 

 Neritostoma J5, (61) 

 Nutting, C. C, hydroids 173-234 



Obelia 191 



borealis 177, 192, 220 



dichotoma 177, igi 



dubia 177, 192, 222 



plicata 177, 191 

 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 



floridana 114 

 Onchidiidse 112 

 Onchidium H2, 114, 115 



boreale (112) 



celticum 113 



nigricans 112 



schrammi 114 



typhae 112 

 Orbis (81) 

 Oreohelix 57 



cooperi 52 



stantoni 52 



strigosa 5/, 52 

 Oxyloma $5 



hungarica 55 



Pagana (36) 



Paludina cincinnatiensis I18 



decisa (125) 



emaiginata (118) 



grana (118) 



hyalina (91) 



limosa (117) 



lustrica 120 



nuclea (119) 



obtusa ( 1 18) 



porata (117) 



seminalis (119) 



