| obeliscum, Vexillum |
obesa, Anachis |
obesa, Cancellaria |
| obesa, Marginella |
obesa, Perrona |
obesus, Tectus |
| obliquata, Scalptia |
oblonga, Cancellaria |
oblonga, Prunum |
| obscura, Colubraria |
obscurus, Conus |
obsoleta, Ilyanassa |
| obtectum, Teinostoma |
obtusa, Amalda |
obtusa, Austrocochlea |
| obtusa, Cerithidea |
obtusa, Marginella |
obtusata, Demoulia |
| *obvelata, Cypraea |
obvelata nubilis, Cypraea |
occa, Murex |
| occidentale, Epitonium |
*occidentalis, Aporrhais |
occidentalis, Cypraea |
| occidua, Notovoluta |
occulosum, Typhisopsis |
ocellata, Cypraea |
| ocellata, Leucozonia |
ocellata, Nitidella |
ocellata, Pyrene |
| ocellata, Scabricola |
ocellifera, Pleuroploca |
ochroleucus, Conus |
| ochroleucus, Trochus |
ochroleucus tmetus, Conus |
ochrostoma, Drupella |
| octangulatum, Dentalium |
octogonus, Murexsul |
octoradiata, Hemitoma |
| oculus, Patella |
oishii, Conus |
*oldi, Strombus |
| oldroydii, Calinaticina |
oleacea, Zierliana |
olearium, Cymatium |
| olearium, Ranella |
*olearium, Tonna |
*olearium atlantica, Ranella |
| oliva, Oliva |
oliva oriola, Oliva |
olivacea, Astraea |
| olivacea, Knefastia |
olivaceus, Nassarius |
olivaceus, Zeuxis |
| olivaeformis, Imbricaria |
*olivaeformis, Marginella |
*olla, Cymbium |
| olssoni, Calliostoma |
omaria, Conus |
onca, Natica |
| oneratus, Nassarius |
oniscus, Morum |
onyx, Cypraea |
| *onyx adusta, Cypraea |
*onyx succincta, Cypraea |
opalina, Mesalia |
| opalus, Cantharidus |
optima, Amalda |
orbignyi, Conus |
| orbignyi, Fossarus |
orbignyi coriolisi, Conus |
orbignyi elokismenos, Conus |
| *orbita, Neothais |
orchidiflorus, Chicoreus |
orchidiflorus, Pterynotus |
| orchidiflorus cerinamarumai, Pterynotus |
oregon, Calliostoma |
oregonensis, Fusitriton |
| oregonensis galea, Fusitriton |
*oriens, Fissurella |
orientalis, Mitra |
| orion, Conus |
ormesi, Penion |
*ornata, Marginella |
| ornata, Oliva |
ornata, Terebra |
ornata, Triphora |
| orri, Muricopsis |
oryza, Trivirostra |
oryzata, Serpulorbis |
| ostergaardi, Cypraea |
otohimeae, Conus |
ottoi, Calliotropis |
| oualaniensis, Theodoxus |
ovina, Haliotis |
ovula, Tralia |
| ovulata, Pyrene |
ovuliformis, Bullata |
*ovum, Liomesus |
| ovum, Ovula |
ovum chrysostoma, Cypraea |
ovum ovum, Cypraea |
| owenii owenii, Cypraea |
*owenii vasta, Cypraea |
*oximeris maculata, Terebra |
| oxyacantha, Homalocantha |
oxychone, Vanikoro |
oxyglyptus, Antillophos |
| oxytatus, Muricopsis |
oxytropia, Philippia |
oyamai, Tutufa |
