INDEX TO GENERA. 
Acanthina 
Acanthinueella 
Acanthochitona- 
Acar 
Acharax 
Acila ^ 
Acirsa 
Adis 
Acmaea 
Acteon 
Adeocina 
Admete 
Adula 
Aesopus 
Aforia 
Agathotoma 
Aglaja 
Agriodesma 
Alaba 
Alabina 
Alectrion 
Aides 
Alexandromenia. 
Algamorda 
Algaroda 
Alia 
Aligena 
Alipurpura 
Allogramma 
Alvania 
Amaura 
Amauropsis 
Amiantis 
Amphithalamus- 
Amphissa 
Area 
Anachis 
Anaplocamus 
Anatina 
Ancistrolepis 
Angulus 
Anisodonta 
Anomalosipho—. 
Anomia 
Antigona 
Antiplanes 
Page. 
Aptyxis 88 
Aquilonaria 1^5 
Area 16 
Ardiivesica 46 
Arcopagia 45 
Arctonchis 67 
Arene 173 
Argobuccinum — 141 
Asperoscala 114 
Astarte 29 
Asthenothaerus 25 
Astraea — 172 
Astyris 104 
Atlanta 138 
Atrimitra 86 
Atrina 17 
Atys 62 
Aulacofusus 93 
Austrotrophon 109 
Axinopsis 34 
Aximilus 34 
Bankia 56 
Barbatia 16 
Barleeia 156 
Barnea 55 
Bartsdiella 127 
Basiliochiton : 189 
Bathyarca 16 
Beringius 90 
Bernardina 30 
Besla 128 
Bittium 145 
Bivonia 150 
Boetica 154 
Boreomelon 86 
Boreoscala 114 
Bornia 38 
Borsonella 72 
Botula 22 
Bradiydontes 22 
Brocktonia 62 
Buccinum 98 
Bufonaria 141 
Bulbus 166 
Bullaria 63 
Bullinella 63 
Bursa 141 
Pago. 
112 
112 
197 
16 
9 
10 
114 
119 
168 
60 
61 
84 
22 
105 
68 
64 
27 
155 
145 
102 
151 
199 
153 
153 
103 
36 
106 
27 
158 
135 
166 
41 
158 
105 
16 
103 
160 
51 
92 
45 
88 
95 
21 
41 
71 
203 
