| ulvae, Hydrobia |
umbilicalis, Gibbula |
umbilicata, Iodina |
| umbilicata, Sigaretotrema |
umbilicatum, Phalium |
*umbilicatus, Melo |
| uncinarius, Murex |
uncinarius, Poropteron |
uncinata, Cavolinia |
| undata, Micromelo |
undata, Nerita |
undatiruga, Fusiturris |
| *undatum, Buccinum |
*undatum conoid, Buccinum |
*undatum schneideri, Buccinum |
| undatus, Clanculus |
undatus, Fusinus |
*undosa, Astraea |
| undosa, Lischkeia |
undosus, Cantharus |
*undulata, Amoria |
| undulata, Littorina |
undulata, Natica |
*undulata, Semicassis |
| undulata, Subninella |
undulata, Terebra |
*undulatum, Phalium |
| undulatus, Fusinus |
unedo, Gemmula |
ungaricus, Capulus |
| unguis, Astraea |
unguis, Scutus |
unicarinata, Iphinoe |
| unicum, Calliostoma |
unicum, Clinopegma |
unicum, Tristichotrochus |
| unidentatus, Murex |
unifascialis, Vexillum |
unifasciata, Melarapha |
| unifasciata, Natica |
unifasciatum, Epitonium |
unifasciatum, Vexillum |
| unilirata, Turbonilla |
unimaculata, Imaclava |
uniplicata, Neosimnia |
| unizonalis, Clavus |
unknown, Dentalium |
unknown, Melongena |
| unknown, Strombus |
unknown, Vasum |
urashimanus, Conus |
| urasima, Baryspira |
urceolata, Cancellaria |
urceus, Olivancillaria |
| urceus incisus, Strombus |
urceus orrae, Strombus |
*urceus urceus, Strombus |
| *urceus ustulatus, Strombus |
uretai, Olivancillaria |
*ursellus, Cypraea |
| *uruguayensis, Buccinanops |
ustulata, Mitra |
ustulata, Peristernia |
| ustulata, Pervicacia |
ustulatus, Conus |
uva, Morula |
