20 



8 Unio (Alasmodonta) Rugo- 



sus, p. V&tr % \ \ 



9 Complanatus (Alasmo- 

 donta), p. 210 



— Multiradiatus, p. 190 



— Retusus, p. 90S 



— Asperrimus, p. 178 



— Littoralis, p. 201 



— Varicosus, p. 181 



— Fabalis, p. 196 



— Subplanus, app. 



— Camptodon, p. 198 



— Atratus, app. 



— Medellinus, p. 193 



— Complanatus, p. 199 



— Plicatus, p. 175 



— Pectorosus, p. 189 



— (Alasmodonta) Margi- 

 natus, p. 211 



— Verrucosus, p. 180 



— Australis, p. 192 



— Clairbornensis, p. 192 



— Fontainianus, D'Orb. 



10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 



21 



22 

 23 



24 

 25 



26 



27 



= rotundus, var. Wag- 

 ner, APP. 



28 Interruptus, p. 191 



29 Auratus, p. 199 



30 Bilineatus, p. 207 



31 Metanever, p. 179 



32 Lienosus, p. 194 



33 Elegans, p. 183 



34 Unio Pustulosus, p. 180 

 35 Triangularis, p. 183 



36 Dehiscens, p. 204 



37 Iris, p. 206 



38 Tappanianus, p. 209, 



= viridis, Conrad, teste 

 Lea 



Niloticus, p. 197 

 Caffer, app. 

 Lgevissimus, p. 174 

 Heterodon, p. 183 

 Rubiginosus, p. 185 

 Pileus, p. 185 

 Inflatus, p. 174 

 Gibber, p. 185 

 DolabraBformis, p. 189 

 Rangianus, p. 187 

 Lamellatus, p. 194 

 Bengalensis, p. 194 

 Turgidus, p. 180 

 Nicklinianus, p. 175 

 Murchisonianus, p. 177 

 Camelus, p. 184 

 Sowerbyanus, p. 185 



56 Delodontus, p. 194 



57 Discoideus, p. 214 



58 Emarginatus, p. 210 



59 Parallelopipedon, p. 



39 



40 

 41 

 42 

 43 

 44 

 45 

 46 

 47 

 48 

 49 

 50 

 51 

 52 

 53 

 54 

 55 



60 



205 

 — Corrianus, p. 207 



