Table Two
Aquatic Molluscs known from the basin of Cuatro Ciénegas, Coahuila, México. An (*) denotes a species known only from the basin, and two asterisks (**) denote a geuns known only from the basin (Taylor, 1966 and unpublished data).
| SPHAERIIDAE | ASSIMINEIDAE |
| Pisidium sp. | Assiminea n. sp. |
| HYDROBIIDAE | LYMNAEIDAE |
| *Cochliopina n. sp.. | Bakerilymnea techella (Haldeman) |
| *C. milleri Taylor | Fossaria modicella (say) |
| C. riograndensis (Pilsbry & Ferriss) | ANCYLIDAE |
| **Coahuilix hubbsi Taylor | Ferrissia sp. |
| **Mexipyrgus n. spp. (2) | PLANORBIDAE |
| M. carranzae Taylor | *Drepanotrema? n. sp. |
| M. churincaenus Taylor | Palnorbella tenuis (Dunker) |
| M. escobedae Taylor | Micromenetus brongniartianus (Lea) |
| M. lugio Taylor | PHYSIDAE |
| M. mojarralis Taylor | Physa virgata Gould |
| M. multlineatus Taylor | |
| **Nymphophilus n. sp. | |
| N. minckley Taylor | |
| **Mexiithauma quadripaludium Taylor | |
| **Paludiscala caramba Taylor | |
| Hydrobiinae, genus uncertain |