INDEX 



Acella Hald 6, 8 



Acroloxus Beck 1 1 8 



Actinonaias C. and F 66, 75 



Acuta (Pleurocera) Raf 36, 151 



Acutifilosa (Goniobasis) Stearns 154 



Acutifilosa siskiyouensis Pils 154 



Acutifilosa (Melania) Stearns 154 



Acutissima (Amnicola) Frfld 137 



Acutissima (Hydrobia) Frfld 137 



Acutissima (Paludestrina) Frfld 137 



Acutocarinata (Melania) Lea 149 



Acutum (Cyclostoma) Drap 29 



Adusta (Goniobasis) Anth 157 



^•Equicostata (Bythinella) Pils 137 



yTLquicostata (Paludestrina) Pils 137 



jEsopus (Pleurobema) Green 171 



^Esopus (Unio) Green 50, 171 



Affine (Pleurocera) Lea 151 



Affine (Trypanostoma) Lea 151 



Alabamensis (Amphigyra) Pils 22, 123 



Alabamensis (Cyrena) Cless , 187 



Alabamensis (Planorbis) Pils 95, 98 



Alabamensis avus (Planorbis) Pils 95 



Alarapetis v. Marts 106 



Alasmidonta Say 56, 62, 1 78 



Alasminota Ort 59, 61, 177 



Alasmodontina (Complanaria) Stimp. ... 177 



Alata (Lampsilis) Say 180 



Alatus (Unio) Say 72, 177 



Albanyensis (Goniobasis) Lea 154 



Albofilata (Physa) Ancey 106, no 



Albus (Planorbis) Mull 13, 94, 100 



Aldrichi (Bythinella) C. and B 137 



Aldrichi (Paludestrina) C. and B 137 



Aldrichi (Somatogyrus) Walk 142 



Altilis (Melania) Lea 33 



Altipetum (Pleurocera) Anth 151 



Altonensis (Physa) Lea 106, no 



Altus (Ancylus) Tryon 117 



Altus (Lanx) Tryon 117 



Alveare (Pleurocera) Con 151 



Ambigua (Alasmodonta) Say 64, 178 



Amblema Raf 42, 47, 170, 171 



Ambloxis Raf 127 



Ammon (Planorbis) Gld '. 103 



Amnica (Tellina) Miill 88, 200 



Amnicola G. and H 28, 133 



Amnicolidse 23, 27, 132 



Amnicolinae Gill 27, 28, 133 



Amnicoloides '(Somatogyrus) Walk. 143 



Amnicum (Pisidium) Miill 200 



AmcEna (Lampsilis) Lea 181 



Amphigyra Pils 22 123 



Ampullacea (Physa) Gld 107 



Ampullacea Columbiana (Physa) Hemp. . 107 



Ampullaria Lam 23, 123 



Ampullariidse 23, 123 



Amygdalonaias C. and F 65, 69 



Amygdalus (Physa) Sby 107 



Anaticulus ohiensis (Unio) DeG 172 



Anatina (Physa) Lea 107, 113 



Ancillaria (Physa) Say ....106, 107, no, 115 



Ancillaria crassa (Physa) Walk 107 



Ancillaria magnalacustris (Physa) Walk. . 107 



Anculosa Say 34, 37, 127, 149, 163 



Ancylidse 5, 16, 117 



Ancyliformis (Gundlachia) Pfr 20, 121 



Angitrema Hald 35, 149, 150 



Angitremoides (lo) C. C. Ads 199 



Angulata (Angitrema) Weth 150 



Angulata (Anodonta) Lea 54 



Angulata (Lithasia) Weth 150 



Angulata (Tulotoma) Lea 130 



Angustatus cuniculus (Unio) DeG 184 



Anodonta Lam 55, 56, 176 



Anodontinae Ort 42, 54, 176 



Anodontoides Simp 55, 57, 177 



Anodontoides (Lampsilis) Say 181 



Anthonyi (AncUlosa) Budd 36 



Anthonyi (Eurycoelon) Budd 149 



Antrosus (Planorbis) Con 95, 100 



Antrosus angistomus (Planorbis) Hald. . . 95 

 Antrosus arostookensis (Planorbis) Pils. . 95 

 Antrosus corrugatus (Planorbis) Curr. . . 95 

 Antrosus percarinatus (Planorbis) Walk.. 95 

 Antrosus portagensis (Planorbis) Baker . 96 

 Antrosus royalensis (Planorbis) Walk. . . 96 



Antrosus striatus (Planorbis) Baker 96 



Antrosus unicarinatus (Planorbis) Hald. . 96 



Apicina (Lymnaea) Lea 93 



Aplectoides (Physa) Sterki 107 



Aplexa Flem 15, 16, 116 



Arachnoidea (Goniobasis) Anth 155 



Arata (Goniobasis) Lea 155 



Aratum (Pleurocera) Lea 151 



Arcidens Simp 55, 57 



Arcticus (Planorbis) Moll 96 



Arctior fisheropsis (Unio) DeG 175 



Arcula (Margaritana) Lea 64 



Argenteum pannosum (Pleurobema) 



Simp .' 171, 173 



Arizonensis (Planorbis) P. and F 96 



Arkansensis (Anculosa) Hink 163 



Arkansensis (Lampsilis) Lea 181 



Arkansia Q. and W 55, 58 



Armiger Hartm 13, 94 



Armigera (Melania) Say 35, 149 



Armigera (Segmentina) Say 104 



Armigera campestris (Segmentina) Dawson 104 



Armigerus (Planorbis) Say 14 



Askewi (Quadrula) Marsh 166 



Asperrimus (Unio) Lea 167 



Aspidobranchia 37 



Aterina (Goniobasis) Lea 155 



Athleta (Goniobasis) Anth 158 



Atropurpureum (Alasmodon) Raf 178 



Attenuata (Amnicola) Hald 138 



Attenuata (Bythinella) W. G. Binn 138 



Augustina (Amnicola) Pils 133 



Aurea (Physa) Lea 108, no 



Aureus (Somatogyrus) Tryon 143 



Auricularia (Lymnaea) L 7, 93 



