SYSTEMATIC INDEX. 
Page 
I.—Svus-Crass GASTROPODA. 
II.—Order PRosoBRaNncHIA. 
II.—Sub-Order CrENOBRANCHIA. 
I.—Group TazwtogLossa. 
Section A. Holostoma— 
Family Ampullariide 
Genus Ampullaria 
Sub-Genus Pomus 
a Saulea 
Genus Marisa 
;,  Lanistes. 
Family Valvatide 
Genus Valvata . 
Sub-Genus Lyogyrus . 
Genus Heterocyclus 
Family Paludinide 
Genus Larina 
»  Paludina 
Sub-Genus Lioplax 
3 Tulostoma 
* Campeloma 
Genus Cleopatra 
>» Margarya 
»  Neothauma 
Sub-Family Benedictiine 
Genus Benedictia . 
Sub-Family Bythiniine 
Genus Bythinia 
Sub-Genus Fossarulus 
- Hydrobioides 
Genus Stenothyra 
Family Rissoide 
Sub-Family Hydrobiine 
Genus Hydrobia 
Sub-Genus Bythinella 
3 Tryonia 
5 Pseudamnicola 
Genus Amnicola 
Sub-Genus Pomatopyrgus 
Genus Cochliopa f 
»  Fluminicola 
”  Gillia 
Genus Somatogyrus 
»  Lithoglyphus . 
Sub-Genus Spekia 
53 Jullienia . 
55 Lacunopsis 
Genus Emmericia 
»  Pachydrobia 
»  Hemistomia 
»  Tricula . 
» Baikalia . 
55 . Trachybaikalia. 
Sub- Family Skeneinze 
Genus Skenea 
Sub-Family Pomatiopsine : 
Genus Pomatiopsis 
Sub-Family Assimineinz 
Genus Assiminea 
Sub-Family Rissoinine 
Genus Rissoina . 
Sub-Genus Iravadia . 
es Isseliella . 
Genus Fairbankia 
»  Folinia 
»  Rissoa 
»  Alvania . 
»  Jenella . 
»  Onoba . 
Sub-Genus Ceratia 
55 Hyala . 
Genus Amphithalmus 
»  Cingula . 
Sub-Genus Putilla 
Genus Setia 
»  Nevillia . 
»,  atoniella 
»  Crossea . 
»  Anabathron 
Scaliola . 
»  Microstelma 
>  Corena 
Rissopsis 
Family Heterophrosy nide . 
Genus Jeffreysia 
»  Barleeia . 
