208 



Index 



Modesta (lo) Lea 



Modoci (Fluminicola) Hann 



Monas (Paludestrina) Pils 



Moniliferum (Trypanostoma) Lea 



Monodonta (Margaritana) Say 



Monodonta (Unio) Say 



Monroensis (Bythinella) Dall 138, 



Monroensis (Bythinella) Tryon 



Monroensis (Hydrobia) Frfld 



Monroensis (Littoridina) Frfld 30, 



Monroensis (Paludestrina) Dall 



Montanensis (Lymnasa) Baker 



Moquinianum (Pisidium) Bgt 



Miihlfeldianus pluriniaffinis (Unio) DeG. . 



Multicarinata (Vivipara) Hald 



Multilineatus (Planorbis) Van 



Multivolvis (Planorbis) Case 97, 



Murrayensis (Goniobasis) Lea 



Musculium Link 85, 87, 



Mytiloides (Pleurobema) Raf 



Mytilopsis Con 



Nanus (Somatogyrus) Walk 



Napoideum (Pleurocera) Lea 



Napoideum (Trypanostoma) Lea 



Nathorsti (Planorbis) West 



Nautileus (Planorbis) Walk 



Nyadina DeG 



Nebulosa (Lampsilis) Con 181, 



Neglectum (Pleurocera) Anth 



Neomexicana (Amnicola) Pils 



Neoplanorbinse Hann 17, 2.2, 



Neoplanorbis Pils 22, 



Neritidae 37. 



Neritina Lam 38, 



Nevadensis (Fluminicola) Walk 



Nevadensis (Pyrgula) Stearns 30, 



Nevadensis (Pyrgulopsis) Stearns 



Newberryi (Ancylus) Lea 17, 



Newberryi minor (Carinifex) Coop 



Newberryi (Goniobasis) Lea 



Newberryi (Lanx) Lea 117, 



Newberryi (Planorbis) Lea 



Niagarensis (Physa) Lea 



Nicklinii (Physa) Lea 1 10, 



Nickliniana (Paludestrina) Lea 29, 



Nickliniana attenuata (Paludestrina) Hald. 



Nigerrima (Lampsilis) Lea 



Nigra (Unio) Raf 



Nigra maculata (Unio) Raf 



Nigrina (Goniobasis) Lea 155, 156, 



Nobilis (lo) Lea 



Nodosa (lo) Lea 



N.odulata (Obliquaria) Raf 



Nolani (Vivipara) Tryon 



Nolichuckyensis (lo) C. C. Ads 



Novangli.x (Ancylus) Walk 



Novanglire (Ferrissia) Walk 



Noveboracense proclive (Pisidium) Sterki 



Nuciforme (Pleurocera) Lea 



Nuciforme (Trypanostoma) Lea 



Nuttallii (Acroloxus) Hald 117, 



Nuttallii (Lanx) Hald 



Nuttallii (Physa) Lea 107, loS, 



Nuttallii (Vellettia) Hald 



200 

 142 

 138 

 153 

 165 

 41 

 141 

 141 

 141 

 141 

 138 

 94 

 87 

 183 

 126 

 102 

 101 

 159 



76 



Nutlalliana (Amnicola) Frfld 133, 146 



Nuttalliana (Paludina) Lea •. 32 



Obesa (Melantho) Lewis 



Obesa (Paludina) W. G. Binn 



Obesa (Tritogonia) Simp 



Obesa (Vivipara) Tryon . . . .' 



Obesus (Melantho) Lewis 



Obliqua (Quadrula) Lam. ..166, 167, 168, 



Obliquaria Raf 65. 



Obliquata (CJbliquaria) Raf 



Obliquus (Ancylus) Shimek 



Obovalis (Obovaria) Raf 



Obovaria Raf 66, 73, 



Obovata (Lithasia) Say 35, 



Obovata biconica (Lithasia) Pils 



Obrussa (Lymnaea) Say 



Obscura (Ferrissia) Hald 



Obscurus (Ancylus) Hald 



Obstructa (Segmentina) Mor 



Obstructus (Planorbis) Mor 



Obtusa (Paludina) Lea 



Obtusa (Valvata) Dr 



Obtusale (Pisidium) C. Pfr 189, 



Obtusus (Somatogyrus) Walk 



Occidentalis (Lampsilis) Con 



Occidentalis (Physa) Tryon no, 



Occidentalis (Planorbis) Coop loi, 



Ocmulgeensis dominus (Unio) DeG 



Ohioensis (Lastena) Raf 



Oleacea (Physa) Try no, 



Olivacea (Amnicola) Pils 



Olivaceus (Planorbis) Spix 11, 



Olivaria (Amblema) Raf 



Oneida (Amnicola) Pils 



Opercularis (Planorbis) Gld. 12, 94, 97, loi, 

 Opercularis multilineatus (Planorbis) Van. 

 Opercularis oregonensis (Planorbis) Van. 

 Opercularis planulatus (Planorbis) Coop.. 



Orbiculata (Amnicola) Lea . 



Orbiculata (Lampsilis) Hild 



Orbiculus (Planorbis) Mor loi, 



Oregonensis (Ancylus) Cless 



Oregonensis (Planorbis) Tryon 102, 



Ornata (Goniobasis) Lea 



Osculans (Physa) Hald 



Osculata (Goniobasis) Lea 36, 154, 



Ovalis (Ancylus) Mse 



Ovalis (Ferrissia) Mse 



Ovata (Lampsilis) Say 



Ovatus (Unio) Say 



Ovoidea (Gyrotoma) Shutt 



Ozarkensis (Fusconaia) Call ....171, 172, 



Ozarkensis (Goniobasis) Call 



Ozarkensis (Lampsilis) Call 173. 



Ozarkensis (Pyrgulopsis) Hink 



Fallens (Unio) Raf 



Pallescens (Unio) DeG 



Pallida (Amnicola) Hald 134- 



Pallidum (Pleurocera) Lea 



Paludestrina d'Orbigny 28, 29, 



Paludosa (Ampullaria) Say 23, 



Palustris (Lymnxa) Miill 



Papillosa (Goniobasis) Anth 



