| Snail Fauna of Bottom Muds, Liverpool to Havana, 1913-15 to 1920 (Richardson 1920) | |
| Family | Species |
| I Species Surviving in 1920 | |
| Viviparidae | Campeloma subsolidum |
| Pleuroceridae | Pleurocera sp |
| Sphaeriidae | Musculium transversum |
| II Species present in 1913-1915 but not found in 1920 | |
| Viviparidae | Lioplax subcarinata |
| Vivipara contectoides | |
| Vivipara subpurpurea | |
| Pleuroceridae | Goniobasis sp |
| Amnicolidae | Amnicola emarginata |
| Somatogyrus s. | |
| Valvatidae | Valvata bicarnata |
| V. tricarinata | |
| Planorbinae | Planorbis trivolvis |
| P. parvus | |
| Physidae | Physa spp. |
| Sphaeriidae | Sphaerium stamineum |
| S. striatinum | |
| S. simile | |
| Musculium jayanum | |
| Ancyclidae | Ancylus sp. |
